diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/raco/config.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/raco/config.scrbl
index 2ff79caaf9..480b596b62 100644
--- a/pkgs/racket-pkgs/racket-doc/scribblings/raco/config.scrbl
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/raco/config.scrbl
@@ -1,5 +1,6 @@
 #lang scribble/doc
 @(require scribble/manual
+          "common.rkt"
           (for-label racket/base
                      racket/contract
                      setup/dirs))
@@ -12,8 +13,6 @@ selected at install time, or its location can be changed via the
 command-line flag. Use @racket[find-config-dir] to locate the
 configuration directory.
 
-
-
 Modify the @filepath{config.rktd} file as described below to configure
 other directories, but use the @racketmodname[setup/dirs] library (which
 combines information from the configuration files and other sources)
@@ -27,36 +26,49 @@ symbolic keys:
 
  @item{@racket['doc-dir] --- a path, string, or byte string for the
        main documentation directory. The value defaults to a
-       @filepath{doc} sibling directory of the main collection
-       directory's parent.}
+       @filepath{doc} sibling directory of the configuration directory.}
 
  @item{@racket['lib-dir] --- a path, string, or byte string for the
-       main library directory; it defaults to the parent of the main
-       collection directory.}
+       main library directory; it defaults to a @filepath{lib} sibling
+       directory of the configuration directory.}
+
+ @item{@racket['lib-search-dirs] --- a list of paths, strings, byte
+       strings, or @racket[#f] representing the search path for
+       directories containing foreign libraries; each @racket[#f] in
+       the list, if any, is replaced with the default search path,
+       which is the user- and version-specific @filepath{lib}
+       directory followed by the main library directory.}
 
  @item{@racket['dll-dir] --- a path, string, or byte string for a
        directory containing Unix shared libraries for the main
        executable; it defaults to the main library directory.}
 
- @item{@racket['include-dir] --- a path, string, or byte string for
-       the main directory containing C header files; it defaults to an
-       @filepath{include} sibling directory of the main library
-       directory.}
+ @item{@racket['links-file] --- a path, string, or byte string for the
+       @tech[#:doc reference-doc]{collection links file}; it defaults
+       to a @filepath{links.rktd} file in the main library directory.}
+
+ @item{@racket['links-search-files] --- like @racket['lib-search-dirs],
+       but for @tech[#:doc reference-doc]{collection links file}.}
+
+ @item{@racket['pkg-dir] --- a path, string, or byte string for
+       packages that have installation scope; it defaults to the main
+       library directory.}
+
+ @item{@racket['pkg-search-dirs] --- like @racket['lib-search-dirs],
+       but for packages in installation scope.}
 
  @item{@racket['bin-dir] --- a path, string, or byte string for the
        main directory containing executables; it defaults to a
        @filepath{bin} sibling directory of the main library
        directory.}
 
- @item{@racket['doc-search-dirs] --- a path, string, byte string, or
-       @racket[#f] representing the search path for documentation;
-       each @racket[#f] in the list, if any, is replaced with the
-       default search path, which is the user- and version-specific
-       @filepath{doc} directory followed by the main documentation
-       directory.}
+ @item{@racket['doc-search-dirs] --- like @racket['lib-search-dirs],
+       but for directories containing documentation.}
 
- @item{@racket['lib-search-dirs] --- like @racket[doc-search-dirs],
-       but for directories containing foreign libraries.}
+ @item{@racket['include-dir] --- a path, string, or byte string for
+       the main directory containing C header files; it defaults to an
+       @filepath{include} sibling directory of the main library
+       directory.}
 
  @item{@racket['include-search-dirs] --- like
        @racket[doc-search-dirs], but for directories containing C
diff --git a/pkgs/racket-pkgs/racket-doc/scribblings/raco/setup.scrbl b/pkgs/racket-pkgs/racket-doc/scribblings/raco/setup.scrbl
index 268b7ca379..8274bfcc15 100644
--- a/pkgs/racket-pkgs/racket-doc/scribblings/raco/setup.scrbl
+++ b/pkgs/racket-pkgs/racket-doc/scribblings/raco/setup.scrbl
@@ -16,6 +16,7 @@
                     setup/getinfo
                     setup/pack
                     setup/unpack
+                    setup/link
                     compiler/compiler
                     launcher/launcher
                     compiler/sig
@@ -922,6 +923,41 @@ v
   contains configuration and package information---including
   configuration of some of the other directories (see @secref["config-file"]).}
 
+@defproc[(find-links-file) path?]{
+  Returns a path to the installation's @tech[#:doc
+  reference-doc]{collection links file}.  The file indicated by the
+  returned path may or may not exist.}
+
+@defproc[(get-links-search-files) path?]{
+  Returns a list of paths to installation @tech[#:doc
+  reference-doc]{collection links files} that are search in
+  order. (Normally, the result includes the result of
+  @racket[(find-links-files)], which is where new installation-wide
+  links are installed by @exec{raco link} or @racket[links].) The
+  files indicated by the returned paths may or may not exist.}
+
+@defproc[(find-pkg-dir) path?]{
+  Returns a path to the directory containing packages with
+  installation scope; the directory indicated by the returned path may
+  or may not exist.}
+
+@defproc[(find-user-pkg-dir) path?]{
+  Returns a path to the directory containing packages with
+  user- and version-specific scope; the directory indicated by
+  the returned path may or may not exist.}
+
+@defproc[(find-shared-pkg-dir) path?]{
+  Returns a path to the directory containing packages with
+  user-specific, all-version scope; the directory indicated by the
+  returned path may or may not exist.}
+
+@defproc[(get-pkg-search-dirs) (listof path?)]{
+  Returns a list of paths to the directories containing packages in
+  installation scope.  (Normally, the result includes the result of
+  @racket[(find-pkg-dir)], which is where new packages are installed
+  by @exec{raco pkg install}.) The directories indicated by the returned
+  paths may or may not exist.}
+
 @defproc[(find-doc-dir) (or/c path? #f)]{
   Returns a path to the installation's @filepath{doc} directory.
   The result is @racket[#f] if no such directory is available.}
diff --git a/racket/lib/collects/compiler/compiler-unit.rkt b/racket/lib/collects/compiler/compiler-unit.rkt
index c6735e2502..32c3cdc0d2 100644
--- a/racket/lib/collects/compiler/compiler-unit.rkt
+++ b/racket/lib/collects/compiler/compiler-unit.rkt
@@ -104,14 +104,14 @@
   (define (compile-directory-visitor dir info worker omit-root
                                      #:verbose [verbose? #t] 
                                      #:skip-path [orig-skip-path #f]
+                                     #:skip-paths [orig-skip-paths null]
                                      #:skip-doc-sources? [skip-docs? #f])
     (define info* (or info (lambda (key mk-default) (mk-default))))
     (define omit-paths (omitted-paths dir c-get-info/full omit-root))
-    (define skip-path (and orig-skip-path (path->bytes 
-                                           (simplify-path (if (string? orig-skip-path)
-                                                              (string->path orig-skip-path)
-                                                              orig-skip-path)
-                                                          #f))))
+    (define skip-paths (for/list ([p (in-list (if orig-skip-path
+                                                  (cons orig-skip-path orig-skip-paths)
+                                                  orig-skip-paths))])
+                         (path->bytes (simplify-path p #f))))
     (unless (eq? 'all omit-paths)
       (let ([init (parameterize ([current-directory dir]
                                  [current-load-relative-directory dir]
@@ -125,12 +125,13 @@
                                   (lambda (path) ((compile-notify-handler) path))]
                                  [manager-skip-file-handler
                                   (lambda (path)
-                                    (and skip-path
-                                         (let ([b (path->bytes (simplify-path path #f))]
-                                               [len (bytes-length skip-path)])
-                                           (and ((bytes-length b) . > . len)
-                                                (bytes=? (subbytes b 0 len) skip-path)))
-                                         (cons -inf.0 "")))])
+                                    (and (pair? skip-paths)
+                                         (let ([b (path->bytes (simplify-path path #f))])
+                                           (for/or ([skip-path (in-list skip-paths)])
+                                             (let ([len (bytes-length skip-path)])
+                                               (and ((bytes-length b) . > . len)
+                                                    (bytes=? (subbytes b 0 len) skip-path)
+                                                    (cons -inf.0 "")))))))])
                     (let* ([sses (append
                                   ;; Find all .rkt/.ss/.scm files:
                                   (filter extract-base-filename/ss (directory-list))
@@ -152,13 +153,15 @@
                 (if (and (directory-exists? p*) (not (member p omit-paths)))
                     (compile-directory-visitor p* (c-get-info/full p*) worker omit-root
                                                #:verbose verbose?
-                                               #:skip-path skip-path
+                                               #:skip-path orig-skip-path
+                                               #:skip-paths orig-skip-paths
                                                #:skip-doc-sources? skip-docs?)
                     init))))
           init))))
   (define (compile-directory dir info 
                              #:verbose [verbose? #t] 
                              #:skip-path [orig-skip-path #f]
+                             #:skip-paths [orig-skip-paths null]
                              #:skip-doc-sources? [skip-docs? #f]
                              #:managed-compile-zo [managed-compile-zo
                                                    (make-caching-managed-compile-zo)]
@@ -168,11 +171,13 @@
     (compile-directory-visitor dir info worker omit-root
                                #:verbose verbose?
                                #:skip-path orig-skip-path
+                               #:skip-paths orig-skip-paths
                                #:skip-doc-sources? skip-docs?))
   
   (define (get-compile-directory-srcs dir info 
                                       #:verbose [verbose? #t] 
                                       #:skip-path [orig-skip-path #f]
+                                      #:skip-paths [orig-skip-paths null]
                                       #:skip-doc-sources? [skip-docs? #f]
                                       #:managed-compile-zo [managed-compile-zo
                                                             (make-caching-managed-compile-zo)]
@@ -180,6 +185,7 @@
     (compile-directory-visitor dir info append omit-root
                                #:verbose verbose?
                                #:skip-path orig-skip-path
+                               #:skip-paths orig-skip-paths
                                #:skip-doc-sources? skip-docs?
                                #:managed-compile-zo managed-compile-zo))
   
@@ -187,6 +193,7 @@
 
   (define (compile-collection-zos collection 
                                   #:skip-path [skip-path #f]
+                                  #:skip-paths [skip-paths null]
                                   #:skip-doc-sources? [skip-docs? #f]
                                   #:managed-compile-zo [managed-compile-zo
                                                         (make-caching-managed-compile-zo)]
@@ -200,6 +207,7 @@
                                        omit-root)
                        #:verbose #f
                        #:skip-path skip-path
+                       #:skip-paths skip-paths
                        #:skip-doc-sources? skip-docs?
                        #:managed-compile-zo managed-compile-zo))
 
diff --git a/racket/lib/collects/pkg/lib.rkt b/racket/lib/collects/pkg/lib.rkt
index 95bd56ee04..46046b6d86 100644
--- a/racket/lib/collects/pkg/lib.rkt
+++ b/racket/lib/collects/pkg/lib.rkt
@@ -111,20 +111,17 @@
          (λ (ip) (copy-port ip op)))))))
 
 (define (pkg-dir config?)
-  (build-path (case (current-pkg-scope)
-               [(installation) (if config?
-                                   (find-config-dir)
-                                   (find-lib-dir))]
-               [(user)
-                (build-path (find-system-path 'addon-dir) (current-pkg-scope-version))]
-               [(shared)
-                (find-system-path 'addon-dir)]
-               [else (error "unknown package scope")])
-              "pkgs"))
+  (case (current-pkg-scope)
+    [(installation) (if config?
+                        (find-config-dir)
+                        (find-pkg-dir))]
+    [(user) (find-user-pkg-dir (current-pkg-scope-version))]
+    [(shared) (find-shared-pkg-dir)]
+    [else (error "unknown package scope")]))
 (define (pkg-config-file)
   (build-path (pkg-dir #t) "config.rktd"))
 (define (pkg-db-file)
-  (build-path (pkg-dir #t) "pkgs.rktd"))
+  (build-path (pkg-dir #f) "pkgs.rktd"))
 (define (pkg-installed-dir)
   (pkg-dir #f))
 (define (pkg-lock-file)
@@ -262,7 +259,7 @@
   (if (or (eq? mode held-mode)
           (eq? 'exclusive held-mode))
       (t)
-      (let ([d (pkg-dir #t)])
+      (let ([d (pkg-dir #f)])
         (unless read-only? (make-directory* d))
         (if (directory-exists? d)
             ;; If the directory exists, assume that a lock file is
@@ -411,15 +408,40 @@
 (define (read-pkg-db)
   (if (current-no-pkg-db)
       #hash()
-      (let ([the-db (read-file-hash (pkg-db-file))])
-        ;; compatibility: map 'pnr to 'catalog:
-        (for/hash ([(k v) (in-hash the-db)])
-          (values k
-                  (if (eq? 'pnr (car (pkg-info-orig-pkg v)))
-                      ;; note: legacy 'pnr entry cannot be a single-collection package
-                      (struct-copy pkg-info v
-                                   [orig-pkg `(catalog ,(cadr (pkg-info-orig-pkg v)))])
-                      v))))))
+      (read-pkg-db-file (pkg-db-file))))
+
+(define (read-pkg-db-file file)
+  (let ([the-db (read-file-hash file)])
+    ;; compatibility: map 'pnr to 'catalog:
+    (for/hash ([(k v) (in-hash the-db)])
+      (values k
+              (if (eq? 'pnr (car (pkg-info-orig-pkg v)))
+                  ;; note: legacy 'pnr entry cannot be a single-collection package
+                  (struct-copy pkg-info v
+                               [orig-pkg `(catalog ,(cadr (pkg-info-orig-pkg v)))])
+                  v)))))
+
+;; read all packages in this scope or wider
+(define (merge-pkg-dbs [scope (current-pkg-scope)])
+  (define (merge-next-pkg-dbs scope)
+    (parameterize ([current-pkg-scope scope])
+      (with-pkg-lock/read-only (merge-pkg-dbs scope))))
+  (case scope
+    [(installation)
+     (for*/hash ([dir (in-list (get-pkg-search-dirs))]
+                 [file (in-value (build-path dir "pkgs.rktd"))]
+                 #:when (file-exists? file)
+                 [(k v) (read-pkg-db-file file)])
+       (values k v))]
+    [(shared)
+     (define db (read-pkg-db))
+     (for/fold ([ht (merge-next-pkg-dbs 'installation)]) ([(v k) (in-hash db)])
+       (hash-set ht k v))]
+    [(user)
+     (define db (read-pkg-db))
+     (for/fold ([ht (merge-next-pkg-dbs 'shared)]) ([(v k) (in-hash db)])
+       (hash-set ht k v))]))
+    
 
 (define (package-info pkg-name [fail? #t])
   (define db (read-pkg-db))
@@ -988,30 +1010,7 @@
          descs)
   (define download-printf (if quiet? void printf))
   (define check-sums? (not ignore-checksums?))
-  (define db (read-pkg-db))
-  (define db+with-dbs
-    (let ([with-sys-wide (lambda (t)
-                           (parameterize ([current-pkg-scope 'installation])
-                             (t)))]
-          [with-vers-spec (lambda (t)
-                            (parameterize ([current-pkg-scope 'user])
-                              (t)))]
-          [with-vers-all (lambda (t)
-                            (parameterize ([current-pkg-scope 'shared])
-                              (t)))]
-          [with-current (lambda (t) (t))])
-      (case (current-pkg-scope)
-       [(installation)
-        (list (cons db with-current))]
-       [(user)
-        (list (cons (with-sys-wide read-pkg-db) with-sys-wide)
-              (cons db with-current)
-              (cons (with-vers-all read-pkg-db) with-vers-all))]
-       [(shared)
-        (list (cons (with-sys-wide read-pkg-db) with-sys-wide)
-              (cons (with-vers-spec read-pkg-db) with-vers-spec)
-              (cons db with-current))]
-       [else (error "unknown package scope")])))
+  (define all-db (merge-pkg-dbs))
   (define (install-package/outer infos desc info)
     (match-define (pkg-desc pkg type orig-name auto?) desc)
     (match-define
@@ -1025,7 +1024,7 @@
       (for/hash ([i (in-list infos)])
         (values (install-info-name i) (install-info-directory i))))
     (cond
-      [(and (not updating?) (package-info pkg-name #f))
+      [(and (not updating?) (hash-ref all-db pkg-name #f))
        (clean!)
        (pkg-error "package is already installed\n  package: ~a" pkg-name)]
       [(and
@@ -1084,7 +1083,7 @@
                                 (or (equal? name "racket")
                                     (not (dependency-this-platform? dep))
                                     (hash-ref simultaneous-installs name #f)
-                                    (hash-has-key? db name)))
+                                    (hash-has-key? all-db name)))
                              deps)))
           (and (not (empty? unsatisfied-deps))
                unsatisfied-deps)))
@@ -1418,28 +1417,45 @@
 (define (pkg-show indent #:directory? [dir? #f])
   (let ()
     (define db (read-pkg-db))
-    (define pkgs (sort (hash-keys db) string-ci<=?))
+    (define all-db (if (eq? (current-pkg-scope) 'installation)
+                       (merge-pkg-dbs)
+                       db))
+    (define has-const? (not (equal? all-db db)))
+    (define pkgs (sort (hash-keys all-db) string-ci<=?))
     (if (null? pkgs)
         (printf " [none]\n")
         (table-display
          (list*
-          (list* (format "~aPackage[*=auto]" indent) "Checksum" "Source"
-                 (if dir?
-                   (list "Directory")
-                   empty))
+          (append
+           (list (format "~aPackage[*=auto~a]" 
+                         indent
+                         (if has-const?
+                             "; .=constant"
+                             ""))
+                 "Checksum"
+                 "Source")
+           (if dir?
+               (list "Directory")
+               empty))
           (for/list ([pkg (in-list pkgs)])
-            (match-define (pkg-info orig-pkg checksum auto?) (hash-ref db pkg))
-            (list* (format "~a~a~a"
+            (match-define (pkg-info orig-pkg checksum auto?) (hash-ref all-db pkg))
+            (append
+             (list (format "~a~a~a~a"
                            indent
                            pkg
                            (if auto?
-                             "*"
-                             ""))
+                               "*"
+                               "")
+                           (if (and has-const?
+                                    (not (equal? (hash-ref all-db pkg)
+                                                 (hash-ref db pkg #f))))
+                               "."
+                               ""))
                    (format "~a" checksum)
-                   (format "~a" orig-pkg)
-                   (if dir?
-                     (list (~a (pkg-directory* pkg)))
-                     empty))))))))
+                   (format "~a" orig-pkg))
+             (if dir?
+                 (list (~a (pkg-directory* pkg)))
+                 empty))))))))
 
 (define (installed-pkg-table #:scope [given-scope #f])
   (parameterize ([current-pkg-scope 
diff --git a/racket/lib/collects/racket/HISTORY.txt b/racket/lib/collects/racket/HISTORY.txt
index e4451843c4..36fdbe3a01 100644
--- a/racket/lib/collects/racket/HISTORY.txt
+++ b/racket/lib/collects/racket/HISTORY.txt
@@ -5,6 +5,10 @@ Changed link-file handling to separate "user" and "shared" modes;
 raco link: -u/--user mode installs a version-specific link,
  added -s/--shared for user-specific, all-version links
 Added PLTCONFIGDIR
+Added links-file and links-search-dirs to config, enabling
+ a search path of installation-wide link files
+setup/dir: default paths found relative to the config directory,
+ instead of the main collection directory
 
 Version 5.3.900.1
 Reorganized collections into packages
diff --git a/racket/lib/collects/setup/commands/link.rkt b/racket/lib/collects/setup/commands/link.rkt
index da74390c72..4f086cb439 100644
--- a/racket/lib/collects/setup/commands/link.rkt
+++ b/racket/lib/collects/setup/commands/link.rkt
@@ -1,6 +1,7 @@
 #lang scheme/base
 (require racket/cmdline
          raco/command-name
+         setup/dirs
          "../link.rkt")
 
 (define link-file (make-parameter #f))
@@ -101,7 +102,13 @@
   (printf "User-specific, all-version links:\n")
   (void (links #:user? #t #:shared? #t #:show? #t))
   (printf "Installation links:\n")
-  (void (links #:user? #f #:show? #t)))
+  (void (links #:user? #f #:show? #t))
+  (let ([p (filter file-exists?
+                   (remove (find-links-file) (get-links-search-files)))])
+    (unless (null? p)
+      (printf "Installation constant links:\n")
+      (for ([f (in-list p)])
+        (void (links #:file f #:show? #t))))))
 
 (when (and (remove-mode)
            (null? l1)
diff --git a/racket/lib/collects/setup/dirs.rkt b/racket/lib/collects/setup/dirs.rkt
index 7f6435da8b..8d34b88e6d 100644
--- a/racket/lib/collects/setup/dirs.rkt
+++ b/racket/lib/collects/setup/dirs.rkt
@@ -56,8 +56,9 @@
                  (wrap 
                   (hash-ref (force config-table) key #f)))))
 
+(define-config config:collects-search-dirs 'collects-search-dirs to-path)
 (define-config config:doc-dir 'doc-dir to-path)
-(define-config config:doc-search-dirs 'doc-search-dir to-path)
+(define-config config:doc-search-dirs 'doc-search-dirs to-path)
 (define-config config:dll-dir 'dll-dir to-path)
 (define-config config:lib-dir 'lib-dir to-path)
 (define-config config:lib-search-dirs 'lib-search-dirs to-path)
@@ -65,6 +66,10 @@
 (define-config config:include-search-dirs 'include-search-dirs to-path)
 (define-config config:bin-dir 'bin-dir to-path)
 (define-config config:man-dir 'man-dir to-path)
+(define-config config:links-file 'links-file to-path)
+(define-config config:links-search-files 'links-search-files to-path)
+(define-config config:pkg-dir 'pkg-dir to-path)
+(define-config config:pkg-search-dirs 'pkg-search-dirs to-path)
 (define-config config:cgc-suffix 'cgc-suffix values)
 (define-config config:3m-suffix '3m-suffix values)
 (define-config config:absolute-installation? 'absolute-installation? (lambda (x) (and x #t)))
@@ -84,10 +89,14 @@
   (delay (find-main-collects)))
 
 (provide find-collects-dir
+         get-main-collects-search-dirs
          find-user-collects-dir
          get-collects-search-dirs)
 (define (find-collects-dir)
   (force main-collects-dir))
+(define (get-main-collects-search-dirs)
+  (combine-search (force config:collects-search-dirs)
+                  (list (find-collects-dir))))
 (define user-collects-dir
   (delay (build-path (system-path* 'addon-dir) (version) "collects")))
 (define (find-user-collects-dir)
@@ -110,10 +119,14 @@
          [else (cons (car l) (loop (cdr l)))]))
       default))
 (define (cons-user u r)
-  (if (use-user-specific-search-paths) (cons u r) r))
+  (if (and u (use-user-specific-search-paths))
+      (cons u r)
+      r))
+(define (get-false) #f)
+(define (chain-to f) f)
 
 (define-syntax define-finder
-  (syntax-rules ()
+  (syntax-rules (get-false chain-to)
     [(_ provide config:id id user-id config:search-id search-id default)
      (begin
        (define-finder provide config:id id user-id default)
@@ -130,16 +143,28 @@
          (combine-search (force config:search-id)
                          (extra (extra-search-dir)
                                 (cons-user (user-id) (single (id)))))))]
-    [(_ provide config:id id user-id default)
+    [(_ provide config:id id get-false (chain-to get-default))
      (begin
-       (provide id user-id)
+       (provide id)
+       (define dir
+         (delay
+           (or (force config:id) (get-default))))
+       (define (id)
+         (force dir)))]
+    [(_ provide config:id id get-false default)
+     (begin
+       (provide id)
        (define dir
          (delay
            (or (force config:id)
-               (let ([p (find-collects-dir)])
-                 (and p (simplify-path (build-path p 'up 'up default)))))))
+               (let ([p (find-config-dir)])
+                 (and p (simplify-path (build-path p 'up default)))))))
        (define (id)
-         (force dir))
+         (force dir)))]
+    [(_ provide config:id id user-id default)
+     (begin
+       (define-finder provide config:id id get-false default)
+       (provide user-id)
        (define user-dir
          (delay (build-path (system-path* 'addon-dir) (version) default)))
        (define (user-id)
@@ -288,3 +313,37 @@
            #f)])))
 (define (find-dll-dir)
   (force dll-dir))
+
+;; ----------------------------------------
+;; Links files
+
+(provide find-links-file
+         get-links-search-files)
+
+(define (find-links-file)
+  (or (force config:links-file)
+      (build-path (find-lib-dir) "links.rktd")))
+(define (get-links-search-files)
+  (combine-search (force config:links-search-files)
+                  (list (find-links-file))))
+
+;; ----------------------------------------
+;; Packages
+
+(define-finder provide
+  config:pkg-dir
+  find-pkg-dir
+  get-false
+  config:pkg-search-dirs
+  get-pkg-search-dirs
+  (chain-to (lambda () (build-path (find-lib-dir) "pkgs"))))
+
+(provide find-user-pkg-dir
+         find-shared-pkg-dir)
+(define (find-user-pkg-dir [vers (version)])
+  (build-path (find-system-path 'addon-dir)
+              vers
+              "pkgs"))
+(define (find-shared-pkg-dir)
+  (build-path (find-system-path 'addon-dir)
+              "pkgs"))
diff --git a/racket/lib/collects/setup/link.rkt b/racket/lib/collects/setup/link.rkt
index 77b723d874..d4492951a0 100644
--- a/racket/lib/collects/setup/link.rkt
+++ b/racket/lib/collects/setup/link.rkt
@@ -31,16 +31,7 @@
                        (if shared?
                            (build-path (find-system-path 'addon-dir) "links.rktd")
                            (build-path (find-system-path 'addon-dir) (version) "links.rktd"))
-                       (let ([d (find-config-dir)])
-                         (if d
-                             (build-path d "links.rktd")
-                             (if (or name
-                                     (pair? dirs)
-                                     repair?
-                                     remove?)
-                                 (error 'links
-                                        "cannot find installation configuration path")
-                                 #f))))))
+                       (find-links-file))))
 
   (define need-repair? #f)
 
diff --git a/racket/lib/collects/setup/setup-unit.rkt b/racket/lib/collects/setup/setup-unit.rkt
index 9372344261..6680fa8832 100644
--- a/racket/lib/collects/setup/setup-unit.rkt
+++ b/racket/lib/collects/setup/setup-unit.rkt
@@ -61,7 +61,9 @@
 
   (define name-str (setup-program-name))
   (define name-sym (string->symbol name-str))
-  (define main-collects-dir (find-collects-dir))
+  (define main-collects-dir (simple-form-path (find-collects-dir)))
+  (define main-collects-dirs (for/hash ([p (in-list (get-main-collects-search-dirs))])
+                               (values (simple-form-path p) #t)))
   (define mode-dir
     (if (compile-mode)
       (build-path "compiled" (compile-mode))
@@ -69,9 +71,9 @@
 
   (unless (make-user)
     (current-library-collection-paths
-     (if (member main-collects-dir (current-library-collection-paths))
-       (list main-collects-dir)
-       '())))
+     (for/list ([p (current-library-collection-paths)]
+                #:when (hash-ref main-collects-dirs p #f))
+       p)))
 
   (current-library-collection-paths
    (map simple-form-path (current-library-collection-paths)))
@@ -340,7 +342,7 @@
     (collection-cc! (list collection)
                     #:info-root cp
                     #:path (build-path cp collection)
-                    #:main? (equal? cp main-collects-dir)))
+                    #:main? (hash-ref main-collects-dirs cp #f)))
   (let ()
     (define info-root (find-lib-dir))
     (define info-path (build-path info-root "info-cache.rktd"))
@@ -1026,7 +1028,7 @@
       (for ([c (in-list (current-library-collection-paths))])
         (when (and (directory-exists? c)
                    (not (and (avoid-main-installation)
-                             (equal? c main-collects-dir))))
+                             (hash-ref main-collects-dirs c #f))))
           (define info-path (build-path c "info-domain" "compiled" "cache.rktd"))
           (when (file-exists? info-path)
             (get-info-ht c info-path 'relative))))
diff --git a/racket/lib/collects/setup/unixstyle-install.rkt b/racket/lib/collects/setup/unixstyle-install.rkt
index bce2887d30..200429b920 100644
--- a/racket/lib/collects/setup/unixstyle-install.rkt
+++ b/racket/lib/collects/setup/unixstyle-install.rkt
@@ -440,6 +440,7 @@
   ;; grab paths before we change them
   (define bindir      (dir: 'bin))
   (define librktdir   (dir: 'librkt))
+  (define configdir   (dir: 'config))
   (define (remove-dest p)
     (let ([pfx (and (< destdirlen (string-length p))
                     (substring p 0 destdirlen))])
@@ -451,7 +452,7 @@
   ;; only when DESTDIR is present, so we're installing to a directory that
   ;; has only our binaries
   (fix-executables bindir librktdir)
-  (unless origtree? (write-config librktdir)))
+  (unless origtree? (write-config configdir)))
 
 ;; --------------------------------------------------------------------------
 
diff --git a/racket/src/racket/src/cstartup.inc b/racket/src/racket/src/cstartup.inc
index 7248322b0e..0e2598554b 100644
--- a/racket/src/racket/src/cstartup.inc
+++ b/racket/src/racket/src/cstartup.inc
@@ -1,5 +1,5 @@
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,49,84,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,50,84,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,51,0,0,0,1,0,0,10,0,
 14,0,19,0,32,0,37,0,40,0,47,0,54,0,59,0,63,0,67,0,74,
 0,83,0,87,0,93,0,107,0,121,0,124,0,130,0,134,0,136,0,147,0,
@@ -16,12 +16,12 @@
 120,73,108,101,116,114,101,99,45,118,97,108,117,101,115,66,108,97,109,98,100,
 97,1,20,112,97,114,97,109,101,116,101,114,105,122,97,116,105,111,110,45,107,
 101,121,61,118,73,100,101,102,105,110,101,45,118,97,108,117,101,115,97,36,11,
-8,240,49,89,0,0,95,159,2,17,36,36,159,2,16,36,36,159,2,16,36,
+8,240,76,89,0,0,95,159,2,17,36,36,159,2,16,36,36,159,2,16,36,
 36,16,20,2,3,2,2,2,5,2,2,2,4,2,2,2,6,2,2,2,7,
 2,2,2,8,2,2,2,9,2,2,2,10,2,2,2,11,2,2,2,12,2,
-2,97,37,11,8,240,49,89,0,0,93,159,2,16,36,37,16,2,2,13,161,
-2,2,37,2,13,2,2,2,13,96,38,11,8,240,49,89,0,0,16,0,96,
-11,11,8,240,49,89,0,0,16,0,18,98,64,104,101,114,101,13,16,6,36,
+2,97,37,11,8,240,76,89,0,0,93,159,2,16,36,37,16,2,2,13,161,
+2,2,37,2,13,2,2,2,13,96,38,11,8,240,76,89,0,0,16,0,96,
+11,11,8,240,76,89,0,0,16,0,18,98,64,104,101,114,101,13,16,6,36,
 2,14,2,2,11,11,11,8,32,8,31,8,30,8,29,27,248,22,161,4,195,
 249,22,154,4,80,158,39,36,251,22,89,2,18,248,22,101,199,12,249,22,79,
 2,19,248,22,103,201,27,248,22,161,4,195,249,22,154,4,80,158,39,36,251,
@@ -30,14 +30,14 @@
 248,22,81,194,248,22,132,18,193,249,22,154,4,80,158,39,36,251,22,89,2,
 18,248,22,132,18,199,249,22,79,2,11,248,22,133,18,201,11,18,100,10,13,
 16,6,36,2,14,2,2,11,11,11,8,32,8,31,8,30,8,29,16,4,11,
-11,2,20,3,1,8,101,110,118,49,55,51,57,48,16,4,11,11,2,21,3,
-1,8,101,110,118,49,55,51,57,49,27,248,22,81,248,22,161,4,196,28,248,
+11,2,20,3,1,8,101,110,118,49,55,52,50,48,16,4,11,11,2,21,3,
+1,8,101,110,118,49,55,52,50,49,27,248,22,81,248,22,161,4,196,28,248,
 22,87,193,20,14,159,37,36,37,28,248,22,87,248,22,81,194,248,22,132,18,
 193,249,22,154,4,80,158,39,36,250,22,89,2,22,248,22,89,249,22,89,248,
 22,89,2,23,248,22,132,18,201,251,22,89,2,18,2,23,2,23,249,22,79,
 2,6,248,22,133,18,204,18,100,11,13,16,6,36,2,14,2,2,11,11,11,
 8,32,8,31,8,30,8,29,16,4,11,11,2,20,3,1,8,101,110,118,49,
-55,51,57,51,16,4,11,11,2,21,3,1,8,101,110,118,49,55,51,57,52,
+55,52,50,51,16,4,11,11,2,21,3,1,8,101,110,118,49,55,52,50,52,
 248,22,161,4,193,27,248,22,161,4,194,249,22,79,248,22,89,248,22,80,196,
 248,22,133,18,195,27,248,22,81,248,22,161,4,23,197,1,249,22,154,4,80,
 158,39,36,28,248,22,64,248,22,155,4,248,22,80,23,198,2,27,249,22,2,
@@ -68,8 +68,8 @@
 22,159,9,248,22,155,4,248,22,80,200,64,101,108,115,101,10,248,22,132,18,
 197,250,22,90,2,22,9,248,22,133,18,200,249,22,79,2,5,248,22,81,202,
 99,13,16,6,36,2,14,2,2,11,11,11,8,32,8,31,8,30,8,29,16,
-4,11,11,2,20,3,1,8,101,110,118,49,55,52,49,54,16,4,11,11,2,
-21,3,1,8,101,110,118,49,55,52,49,55,18,158,94,10,64,118,111,105,100,
+4,11,11,2,20,3,1,8,101,110,118,49,55,52,52,54,16,4,11,11,2,
+21,3,1,8,101,110,118,49,55,52,52,55,18,158,94,10,64,118,111,105,100,
 8,48,27,248,22,81,248,22,161,4,196,249,22,154,4,80,158,39,36,28,248,
 22,64,248,22,155,4,248,22,80,197,250,22,89,2,28,248,22,89,248,22,132,
 18,199,248,22,101,198,27,248,22,155,4,248,22,132,18,197,250,22,89,2,28,
@@ -100,660 +100,795 @@
     EVAL_ONE_SIZED_STR((char *)expr, 2051);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,49,84,0,0,0,0,0,0,0,0,
-0,0,0,0,0,0,0,0,0,0,0,0,148,0,0,0,1,0,0,8,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,50,84,0,0,0,0,0,0,0,0,
+0,0,0,0,0,0,0,0,0,0,0,0,170,0,0,0,1,0,0,8,0,
 21,0,26,0,43,0,55,0,77,0,106,0,121,0,139,0,151,0,167,0,181,
-0,203,0,219,0,236,0,253,0,15,1,34,1,53,1,64,1,70,1,79,1,
-86,1,93,1,105,1,117,1,129,1,153,1,185,1,203,1,222,1,242,1,2,
-2,20,2,51,2,65,2,82,2,126,2,134,2,139,2,183,2,190,2,200,2,
-215,2,224,2,229,2,231,2,255,2,20,3,30,3,43,3,53,3,59,3,104,
-3,107,3,111,3,135,3,174,3,177,3,190,3,201,3,214,3,10,4,33,4,
-41,4,65,4,86,4,43,5,73,5,210,8,233,8,250,8,198,10,45,11,59,
-11,219,11,151,13,160,13,169,13,183,13,193,13,234,14,81,15,154,15,227,15,
-75,16,104,16,175,16,56,17,127,17,81,18,182,18,189,18,232,18,246,18,100,
-19,2,20,9,20,72,20,98,20,200,20,139,21,199,21,206,21,74,22,93,22,
-246,22,6,23,212,24,244,24,253,24,72,26,90,26,104,26,125,26,141,26,189,
-26,210,26,230,26,248,26,47,27,17,30,209,30,112,31,126,31,21,34,149,36,
-164,36,54,38,248,38,250,38,20,39,35,39,215,40,153,41,168,41,177,41,184,
-41,53,42,178,42,29,44,120,44,213,44,52,45,2,46,34,46,164,46,0,0,
-248,51,0,0,67,35,37,117,116,105,108,115,72,112,97,116,104,45,115,116,114,
-105,110,103,63,64,98,115,98,115,76,110,111,114,109,97,108,45,99,97,115,101,
-45,112,97,116,104,71,114,101,114,111,111,116,45,112,97,116,104,1,20,102,105,
-110,100,45,101,120,101,99,117,116,97,98,108,101,45,112,97,116,104,1,27,112,
-97,116,104,45,108,105,115,116,45,115,116,114,105,110,103,45,62,112,97,116,104,
-45,108,105,115,116,74,45,99,104,101,99,107,45,114,101,108,112,97,116,104,77,
-45,99,104,101,99,107,45,99,111,108,108,101,99,116,105,111,110,71,45,99,104,
-101,99,107,45,102,97,105,108,75,99,111,108,108,101,99,116,105,111,110,45,112,
-97,116,104,73,102,105,110,100,45,99,111,108,45,102,105,108,101,1,20,99,111,
-108,108,101,99,116,105,111,110,45,102,105,108,101,45,112,97,116,104,75,117,115,
-101,114,45,108,105,110,107,115,45,112,97,116,104,76,117,115,101,114,45,108,105,
-110,107,115,45,99,97,99,104,101,76,117,115,101,114,45,108,105,110,107,115,45,
-115,116,97,109,112,77,115,104,97,114,101,100,45,108,105,110,107,115,45,112,97,
-116,104,78,115,104,97,114,101,100,45,108,105,110,107,115,45,99,97,99,104,101,
-78,115,104,97,114,101,100,45,108,105,110,107,115,45,115,116,97,109,112,70,108,
-105,110,107,115,45,112,97,116,104,65,113,117,111,116,101,68,35,37,112,97,114,
-97,109,122,29,94,2,21,2,22,11,29,94,2,21,2,22,11,71,108,105,110,
-107,115,45,99,97,99,104,101,71,108,105,110,107,115,45,115,116,97,109,112,71,
-102,105,108,101,45,62,115,116,97,109,112,1,22,103,101,116,45,108,105,110,107,
-101,100,45,99,111,108,108,101,99,116,105,111,110,115,1,30,110,111,114,109,97,
-108,105,122,101,45,99,111,108,108,101,99,116,105,111,110,45,114,101,102,101,114,
-101,110,99,101,77,99,104,101,99,107,45,115,117,102,102,105,120,45,99,97,108,
-108,78,112,97,116,104,45,97,100,106,117,115,116,45,115,117,102,102,105,120,79,
-112,97,116,104,45,114,101,112,108,97,99,101,45,115,117,102,102,105,120,75,112,
-97,116,104,45,97,100,100,45,115,117,102,102,105,120,77,108,111,97,100,47,117,
-115,101,45,99,111,109,112,105,108,101,100,1,29,102,105,110,100,45,108,105,98,
-114,97,114,121,45,99,111,108,108,101,99,116,105,111,110,45,112,97,116,104,115,
-73,101,109,98,101,100,100,101,100,45,108,111,97,100,76,110,111,114,109,97,108,
-45,112,97,116,104,45,99,97,115,101,6,41,41,40,111,114,47,99,32,112,97,
-116,104,45,102,111,114,45,115,111,109,101,45,115,121,115,116,101,109,63,32,112,
-97,116,104,45,115,116,114,105,110,103,63,41,67,119,105,110,100,111,119,115,6,
-2,2,92,49,6,41,41,40,111,114,47,99,32,112,97,116,104,45,115,116,114,
-105,110,103,63,32,112,97,116,104,45,102,111,114,45,115,111,109,101,45,115,121,
-115,116,101,109,63,41,6,4,4,112,97,116,104,5,8,92,92,63,92,82,69,
-76,92,6,12,12,112,97,116,104,45,115,116,114,105,110,103,63,68,114,101,108,
-97,116,105,118,101,64,108,111,111,112,5,0,6,21,21,105,110,118,97,108,105,
-100,32,114,101,108,97,116,105,118,101,32,112,97,116,104,6,18,18,40,97,110,
-121,47,99,32,46,32,45,62,32,46,32,97,110,121,41,69,97,100,100,111,110,
-45,100,105,114,6,10,10,108,105,110,107,115,46,114,107,116,100,69,101,120,101,
-99,45,102,105,108,101,65,101,114,114,111,114,6,42,42,101,114,114,111,114,32,
-114,101,97,100,105,110,103,32,99,111,108,108,101,99,116,105,111,110,32,108,105,
-110,107,115,32,102,105,108,101,32,126,115,58,32,126,97,6,0,0,6,1,1,
-47,6,21,21,40,111,114,47,99,32,115,116,114,105,110,103,63,32,98,121,116,
-101,115,63,41,6,36,36,99,97,110,110,111,116,32,97,100,100,32,97,32,115,
-117,102,102,105,120,32,116,111,32,97,32,114,111,111,116,32,112,97,116,104,58,
-32,5,1,95,5,11,80,76,84,67,79,76,76,69,67,84,83,6,8,8,99,
-111,108,108,101,99,116,115,72,99,111,108,108,101,99,116,115,45,100,105,114,27,
-248,22,150,15,23,195,2,28,23,193,2,192,86,94,23,193,1,28,248,22,144,
-7,23,195,2,27,248,22,173,15,23,196,2,28,23,193,2,192,86,94,23,193,
-1,248,22,174,15,23,196,1,11,0,21,35,114,120,34,94,91,92,92,93,91,
-92,92,93,91,63,93,91,92,92,93,34,0,6,35,114,120,34,47,34,0,22,
-35,114,120,34,91,47,92,92,93,91,46,32,93,43,91,47,92,92,93,42,36,
-34,0,19,35,114,120,34,91,32,46,93,43,40,91,47,92,92,93,42,41,36,
-34,86,94,28,28,248,22,151,15,23,195,2,10,28,248,22,150,15,23,195,2,
-10,28,248,22,144,7,23,195,2,28,248,22,173,15,23,195,2,10,248,22,174,
-15,23,195,2,11,12,250,22,168,11,2,37,2,38,23,197,2,28,28,248,22,
-151,15,23,195,2,249,22,159,9,248,22,152,15,23,197,2,2,39,249,22,159,
-9,247,22,171,8,2,39,27,28,248,22,144,7,23,196,2,23,195,2,248,22,
-156,8,248,22,155,15,23,197,2,28,249,22,145,16,2,64,23,195,2,86,94,
-23,193,1,28,248,22,144,7,23,196,2,248,22,158,15,23,196,1,194,27,248,
-22,183,7,23,195,1,249,22,159,15,248,22,159,8,250,22,153,16,2,65,28,
-249,22,145,16,2,66,23,201,2,23,199,1,250,22,153,16,2,67,23,202,1,
-2,40,80,159,44,37,38,2,39,28,248,22,144,7,23,195,2,248,22,158,15,
-23,195,1,193,0,28,35,114,120,34,94,92,92,92,92,92,92,92,92,91,63,
-93,92,92,92,92,85,78,67,92,92,92,92,34,86,95,28,28,28,248,22,150,
-15,23,195,2,10,28,248,22,144,7,23,195,2,28,248,22,173,15,23,195,2,
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-11,2,5,2,41,36,23,199,2,23,200,2,28,28,28,248,22,150,15,23,196,
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-    EVAL_ONE_SIZED_STR((char *)expr, 13644);
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+198,2,28,248,22,139,7,23,194,2,12,86,94,248,22,167,9,23,194,1,248,
+80,159,40,8,43,39,197,86,94,249,22,130,7,247,22,167,5,23,196,2,248,
+22,154,6,249,22,133,4,36,249,22,181,3,23,198,1,23,199,1,27,28,23,
+197,2,86,95,23,196,1,23,195,1,23,197,1,86,94,23,197,1,27,248,22,
+191,15,2,58,27,250,80,159,42,40,39,23,197,1,11,11,27,248,22,136,4,
+23,199,1,27,28,23,194,2,23,194,1,86,94,23,194,1,36,27,248,22,136,
+4,23,202,1,27,28,23,194,2,23,194,1,86,94,23,194,1,36,249,22,134,
+6,23,199,1,20,20,95,88,163,8,36,36,48,11,9,224,4,2,33,168,2,
+23,195,1,23,197,1,27,248,22,183,5,23,195,1,248,80,159,39,8,43,39,
+193,159,36,20,114,159,36,16,1,11,16,0,20,26,145,9,2,1,2,1,29,
+11,11,11,11,9,9,11,11,11,10,43,80,158,36,36,20,114,159,41,16,39,
+2,2,2,3,2,4,2,5,2,6,2,7,2,8,2,9,2,10,2,11,2,
+12,2,13,2,14,2,15,2,16,2,17,2,18,2,19,2,20,30,2,23,1,
+20,112,97,114,97,109,101,116,101,114,105,122,97,116,105,111,110,45,107,101,121,
+11,6,30,2,23,1,23,101,120,116,101,110,100,45,112,97,114,97,109,101,116,
+101,114,105,122,97,116,105,111,110,11,3,2,24,2,25,2,26,2,27,30,2,
+28,76,102,105,110,100,45,108,105,110,107,115,45,112,97,116,104,33,11,4,2,
+29,2,30,2,31,30,2,28,1,21,101,120,99,101,112,116,105,111,110,45,104,
+97,110,100,108,101,114,45,107,101,121,11,2,2,32,2,33,2,34,2,35,2,
+36,2,37,2,38,2,39,2,40,16,0,37,39,36,16,0,36,16,22,2,9,
+2,10,2,8,2,26,2,3,2,34,2,25,2,31,2,20,2,24,2,32,2,
+29,2,27,2,30,2,33,2,35,2,18,2,17,2,19,2,15,2,14,2,16,
+58,11,11,11,16,13,2,13,2,11,2,40,2,12,2,6,2,39,2,38,2,
+4,2,37,2,7,2,36,2,2,2,5,16,13,11,11,11,11,11,11,11,11,
+11,11,11,11,11,16,13,2,13,2,11,2,40,2,12,2,6,2,39,2,38,
+2,4,2,37,2,7,2,36,2,2,2,5,49,49,37,12,11,11,16,0,16,
+0,16,0,36,36,11,12,11,11,16,0,16,0,16,0,36,36,16,40,20,15,
+16,2,32,0,88,163,36,37,45,11,2,2,222,33,70,80,159,36,36,37,20,
+15,16,2,249,22,146,7,7,92,7,92,80,159,36,37,37,20,15,16,2,88,
+163,36,37,54,38,2,4,223,0,33,75,80,159,36,38,37,20,15,16,2,88,
+163,36,38,58,38,2,5,223,0,33,77,80,159,36,39,37,20,15,16,2,20,
+25,96,2,6,88,163,8,36,39,8,25,8,32,9,223,0,33,84,88,163,36,
+38,47,52,9,223,0,33,85,88,163,36,37,46,52,9,223,0,33,86,80,159,
+36,40,37,20,15,16,2,27,248,22,137,16,248,22,158,8,27,28,249,22,159,
+9,247,22,171,8,2,43,6,1,1,59,6,1,1,58,250,22,128,8,6,14,
+14,40,91,94,126,97,93,42,41,126,97,40,46,42,41,23,196,2,23,196,1,
+88,163,8,36,38,48,11,2,7,223,0,33,90,80,159,36,41,37,20,15,16,
+2,32,0,88,163,8,36,38,47,11,2,8,222,33,91,80,159,36,42,37,20,
+15,16,2,32,0,88,163,8,36,39,48,11,2,9,222,33,93,80,159,36,43,
+37,20,15,16,2,32,0,88,163,8,36,38,46,11,2,10,222,33,94,80,159,
+36,44,37,20,15,16,2,88,163,45,39,49,8,128,16,2,11,223,0,33,96,
+80,159,36,45,37,20,15,16,2,88,163,45,40,50,8,128,16,2,13,223,0,
+33,98,80,159,36,47,37,20,15,16,2,250,22,168,15,248,22,191,15,2,54,
+247,22,162,8,2,55,80,159,36,48,37,20,15,16,2,247,22,137,2,80,158,
+36,49,20,15,16,2,11,80,158,36,50,20,15,16,2,249,22,168,15,248,22,
+191,15,2,54,2,55,80,159,36,51,37,20,15,16,2,247,22,137,2,80,158,
+36,52,20,15,16,2,11,80,158,36,53,20,15,16,2,88,163,36,36,51,8,
+240,16,0,24,0,2,20,223,0,33,99,80,159,36,54,37,20,15,16,2,32,
+0,88,163,8,36,37,46,11,2,24,222,33,100,80,159,36,57,37,20,15,16,
+2,32,0,88,163,36,37,43,11,2,25,222,33,101,80,159,36,58,37,20,15,
+16,2,88,163,8,36,39,54,11,2,26,223,0,33,104,80,159,36,59,37,20,
+15,16,2,248,80,159,37,8,25,37,88,163,8,36,36,53,8,240,16,0,56,
+0,9,223,1,33,107,80,159,36,8,24,37,20,15,16,2,249,22,175,8,248,
+22,178,8,80,159,39,8,24,38,247,22,137,2,80,159,36,8,26,37,20,15,
+16,2,249,22,175,8,248,22,178,8,80,159,39,8,24,38,11,80,159,36,8,
+27,37,20,15,16,2,88,163,36,37,44,16,2,36,8,128,128,2,31,223,0,
+33,115,80,159,36,8,28,37,20,15,16,2,88,163,36,39,46,16,2,8,240,
+0,240,0,0,8,155,244,2,32,223,0,33,125,80,159,36,8,30,37,20,15,
+16,2,88,163,36,38,56,16,2,36,8,240,0,128,0,0,2,33,223,0,33,
+127,80,159,36,8,31,37,20,15,16,2,88,163,8,36,38,8,25,16,4,36,
+8,240,0,65,0,0,8,128,2,36,2,50,223,0,33,128,2,80,159,36,8,
+39,39,20,15,16,2,88,163,36,40,8,33,16,4,36,8,240,0,193,0,0,
+8,128,2,36,2,12,223,0,33,139,2,80,159,36,46,37,20,15,16,2,32,
+0,88,163,36,39,50,11,2,34,222,33,140,2,80,159,36,8,32,37,20,15,
+16,2,32,0,88,163,36,41,8,27,11,2,35,222,33,143,2,80,159,36,8,
+33,37,20,15,16,2,20,27,158,32,0,88,163,36,38,52,11,2,36,222,33,
+146,2,88,163,36,38,49,16,4,36,36,38,36,2,36,223,0,33,148,2,80,
+159,36,8,34,37,20,15,16,2,20,27,158,32,0,88,163,36,38,52,11,2,
+37,222,33,151,2,88,163,36,38,49,16,4,36,36,38,36,2,37,223,0,33,
+152,2,80,159,36,8,35,37,20,15,16,2,20,27,158,32,0,88,163,36,37,
+44,11,2,38,222,33,153,2,32,0,88,163,36,37,44,11,2,38,222,33,154,
+2,80,159,36,8,36,37,20,15,16,2,88,163,8,36,37,51,16,4,52,36,
+8,128,4,36,2,50,223,0,33,155,2,80,159,36,8,40,39,20,15,16,2,
+88,163,8,36,37,51,16,4,52,36,8,128,8,36,2,50,223,0,33,156,2,
+80,159,36,8,41,39,20,15,16,2,88,163,8,36,37,51,16,4,52,36,8,
+128,16,36,2,50,223,0,33,157,2,80,159,36,8,42,39,20,15,16,2,20,
+25,96,2,39,88,163,36,36,55,16,4,8,32,8,36,8,128,4,36,9,223,
+0,33,160,2,88,163,36,37,56,16,4,8,32,8,36,8,128,8,36,9,223,
+0,33,163,2,88,163,36,38,57,16,4,8,32,8,36,8,128,16,36,9,223,
+0,33,166,2,80,159,36,8,37,37,20,15,16,2,88,163,8,36,37,57,16,
+4,36,8,24,8,128,32,36,2,50,223,0,33,167,2,80,159,36,8,43,39,
+20,15,16,2,88,163,8,36,39,54,16,4,52,36,8,128,32,36,2,40,223,
+0,33,169,2,80,159,36,8,38,37,95,29,94,2,21,68,35,37,107,101,114,
+110,101,108,11,29,94,2,21,69,35,37,109,105,110,45,115,116,120,11,2,28,
+9,9,9,36,0};
+    EVAL_ONE_SIZED_STR((char *)expr, 16468);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,49,84,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,50,84,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,14,0,0,0,1,0,0,15,0,
 40,0,57,0,75,0,97,0,120,0,140,0,162,0,171,0,180,0,187,0,196,
 0,203,0,0,0,229,1,0,0,74,35,37,112,108,97,99,101,45,115,116,114,
@@ -783,7 +918,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 557);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,49,84,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,50,84,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,106,0,0,0,1,0,0,7,0,
 18,0,45,0,51,0,60,0,67,0,89,0,102,0,128,0,145,0,167,0,175,
 0,187,0,202,0,218,0,236,0,0,1,12,1,28,1,51,1,75,1,87,1,
@@ -1265,7 +1400,7 @@
     EVAL_ONE_SIZED_STR((char *)expr, 10052);
   }
   {
-    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,49,84,0,0,0,0,0,0,0,0,
+    SHARED_OK static MZCOMPILED_STRING_FAR unsigned char expr[] = {35,126,9,53,46,51,46,57,48,48,46,50,84,0,0,0,0,0,0,0,0,
 0,0,0,0,0,0,0,0,0,0,0,0,11,0,0,0,1,0,0,10,0,
 16,0,29,0,44,0,58,0,78,0,90,0,104,0,118,0,170,0,0,0,99,
 1,0,0,69,35,37,98,117,105,108,116,105,110,65,113,117,111,116,101,29,94,
@@ -1274,7 +1409,7 @@
 2,2,74,35,37,112,108,97,99,101,45,115,116,114,117,99,116,11,29,94,2,
 2,66,35,37,98,111,111,116,11,29,94,2,2,68,35,37,101,120,112,111,98,
 115,11,29,94,2,2,68,35,37,107,101,114,110,101,108,11,97,36,11,8,240,
-132,91,0,0,100,159,2,3,36,36,159,2,4,36,36,159,2,5,36,36,159,
+186,91,0,0,100,159,2,3,36,36,159,2,4,36,36,159,2,5,36,36,159,
 2,6,36,36,159,2,7,36,36,159,2,8,36,36,159,2,9,36,36,159,2,
 9,36,36,16,0,159,36,20,114,159,36,16,1,11,16,0,20,26,145,9,2,
 1,2,1,29,11,11,11,11,9,9,11,11,11,18,96,11,46,46,46,36,80,
diff --git a/racket/src/racket/src/startup.inc b/racket/src/racket/src/startup.inc
index b14f203b78..31884f8c0f 100644
--- a/racket/src/racket/src/startup.inc
+++ b/racket/src/racket/src/startup.inc
@@ -350,17 +350,57 @@
 " \"links.rktd\"))"
 "(define-values(shared-links-cache)(make-hasheq))"
 "(define-values(shared-links-stamp) #f)"
-"(define-values(links-path)(find-links-path!"
+"(define-values(find-config-dir)"
 "(lambda()"
-"(let((d(let((c(find-system-path 'config-dir)))"
-"(if(absolute-path? c)"
+"(let((c(find-system-path 'config-dir)))"
+"(if(complete-path? c)"
 " c"
+"(or(and(relative-path? c)"
 "(parameterize((current-directory(find-system-path 'orig-dir)))"
-"(find-executable-path(find-system-path 'exec-file) c))))))"
-"(and d"
-" (build-path d \"links.rktd\"))))))"
-"(define-values(links-cache)(make-hasheq))"
-"(define-values(links-stamp) #f)"
+"(find-executable-path(find-system-path 'exec-file) c)))"
+"(let((exec(path->complete-path "
+"(find-executable-path(find-system-path 'exec-file))"
+"(find-system-path 'orig-dir))))"
+"(let-values(((base name dir?)(split-path exec)))"
+"(path->complete-path c base))))))))"
+"(define-values(get-config-table)"
+"(lambda(d)"
+" (let ((p (build-path d \"config.rktd\")))"
+"(or(and(file-exists? p)"
+"(call-with-input-file p read))"
+" #hash()))))"
+"(define-values(coerce-to-path)"
+"(lambda(p)"
+"(cond"
+"((string? p)(string->path p))"
+"((bytes? p)(bytes->path p))"
+"(else p))))"
+"(define-values(add-config-search)"
+"(lambda(ht key orig-l)"
+"(let((l(hash-ref ht key #f)))"
+"(if l"
+"(let loop((l l))"
+"(cond"
+"((null? l) null)"
+"((not(car l))(append orig-l(loop(cdr l))))"
+"(else(cons(coerce-to-path(car l))(loop(cdr l))))))"
+" orig-l))))"
+"(define-values(links-paths)(find-links-path!"
+"(lambda()"
+"(let*((d(find-config-dir))"
+"(ht(get-config-table d))"
+"(lf(or(hash-ref ht 'links-file #f)"
+"(build-path(or"
+"(coerce-to-path(hash-ref ht 'lib-dir #f))"
+" (build-path d 'up \"lib\"))"
+" \"links.rktd\"))))"
+"(list->vector"
+"(add-config-search"
+" ht"
+" 'links-search-files"
+"(list lf)))))))"
+"(define-values(links-caches)(make-vector(vector-length links-paths)(make-hasheq)))"
+"(define-values(links-stamps)(make-vector(vector-length links-paths) #f))"
 "(define-values(file->stamp)"
 "(lambda(path)"
 "(call-with-continuation-prompt"
@@ -392,7 +432,7 @@
 " bstr)))"
 "(lambda()(close-input-port p)))))))))"
 "(define-values(get-linked-collections)"
-"(lambda(user? shared?)"
+"(lambda(user? shared? ii)"
 "(call/ec(lambda(esc)"
 "(define-values(make-handler)"
 "(lambda(ts)"
@@ -400,13 +440,13 @@
 "(if(exn:fail? exn)"
 "(let((l(current-logger)))"
 "(when(log-level? l 'error)"
-"(log-message l 'error "
+"(log-message l 'error"
 "(format"
 " \"error reading collection links file ~s: ~a\""
 "(cond"
 "(user? user-links-path)"
 "(shared? shared-links-path)"
-"(else links-path))"
+"(else(vector-ref links-paths ii)))"
 "(exn-message exn))"
 "(current-continuation-marks))))"
 "(void))"
@@ -419,8 +459,8 @@
 "(set! shared-links-cache(make-hasheq))"
 "(set! shared-links-stamp ts))"
 "(else"
-"(set! links-cache(make-hasheq))"
-"(set! links-stamp ts))))"
+"(vector-set! links-caches ii(make-hasheq))"
+"(vector-set! links-stamps ii ts))))"
 "(if(exn:fail? exn)"
 "(esc(make-hasheq))"
 " exn))))"
@@ -430,12 +470,12 @@
 "(let*((a-links-path(cond"
 "(user? user-links-path)"
 "(shared? shared-links-path)"
-"(else links-path)))"
+"(else(vector-ref links-paths ii))))"
 "(ts(file->stamp a-links-path)))"
 "(if(not(equal? ts(cond"
 "(user? user-links-stamp)"
 "(shared? shared-links-stamp)"
-"(else links-stamp))))"
+"(else(vector-ref links-stamps ii)))))"
 "(with-continuation-mark"
 " exception-handler-key"
 "(make-handler ts)"
@@ -506,13 +546,13 @@
 "(set! shared-links-cache ht)"
 "(set! shared-links-stamp ts))"
 "(else"
-"(set! links-cache ht)"
-"(set! links-stamp ts)))"
+"(vector-set! links-caches ii ht)"
+"(vector-set! links-stamps ii ts)))"
 " ht))))"
 "(cond"
 "(user? user-links-cache)"
 "(shared? shared-links-cache)"
-"(else links-cache)))))))))"
+"(else(vector-ref links-caches ii))))))))))"
 "(define-values(normalize-collection-reference)"
 "(lambda(collection collection-path)"
 "(cond"
@@ -543,17 +583,21 @@
 "(append"
 "(if(and links?(use-user-specific-search-paths))"
 "(append"
-"(let((ht(get-linked-collections #t #f)))"
+"(let((ht(get-linked-collections #t #f 0)))"
 "(append(hash-ref ht sym null)"
 "(hash-ref ht #f null)))"
-"(let((ht(get-linked-collections #f #t)))"
+"(let((ht(get-linked-collections #f #t 0)))"
 "(append(hash-ref ht sym null)"
 "(hash-ref ht #f null))))"
 " null)"
-"(if(and links? links-path)"
-"(let((ht(get-linked-collections #f #f)))"
+"(if links?"
+"(let loop((ii 0))"
+"(if(ii . >= .(vector-length links-paths))"
+" null"
+"(let((ht(get-linked-collections #f #f ii)))"
 "(append(hash-ref ht sym null)"
-"(hash-ref ht #f null)))"
+"(hash-ref ht #f null)"
+"(loop(add1 ii))))))"
 " null)"
 "(current-library-collection-paths)))))"
 "(define-values(done)"
@@ -701,6 +745,9 @@
 "(bytes->string/locale c #\\?)"
 " \"\"))"
 " \"\")"
+"(add-config-search"
+"(get-config-table(find-config-dir))"
+" 'collects-search-dirs"
 "(cons-if"
 "(and user-too?"
 "(build-path(find-system-path 'addon-dir)"
@@ -724,7 +771,7 @@
 "(if v"
 "(cons(simplify-path(path->complete-path v(current-directory)))"
 "(loop(cdr l)))"
-"(loop(cdr l))))))))))))"
+"(loop(cdr l)))))))))))))"
 "(define(embedded-load start end str)"
 "(let*((s(if str"
 " str"
diff --git a/racket/src/racket/src/startup.rktl b/racket/src/racket/src/startup.rktl
index 25417a3239..ddabd34936 100644
--- a/racket/src/racket/src/startup.rktl
+++ b/racket/src/racket/src/startup.rktl
@@ -415,22 +415,67 @@
                                                  "links.rktd"))
   (define-values (shared-links-cache) (make-hasheq))
   (define-values (shared-links-stamp) #f)
-  
-  (define-values (links-path) (find-links-path!
-                               ;; This thunk is called once per place, and the result
-                               ;; is remembered for later invocations. Otherwise, the
-                               ;; search for the config file can trip over filesystem
-                               ;; restrictions imposed by security guards.
-                               (lambda ()
-                                 (let ([d (let ([c (find-system-path 'config-dir)])
-                                            (if (absolute-path? c)
-                                                c
-                                                (parameterize ([current-directory (find-system-path 'orig-dir)])
-                                                  (find-executable-path (find-system-path 'exec-file) c))))])
-                                   (and d
-                                        (build-path d "links.rktd"))))))
-  (define-values (links-cache) (make-hasheq))
-  (define-values (links-stamp) #f)
+
+  (define-values (find-config-dir)
+    (lambda ()
+      (let ([c (find-system-path 'config-dir)])
+        (if (complete-path? c)
+            c
+            (or (and (relative-path? c)
+                     (parameterize ([current-directory (find-system-path 'orig-dir)])
+                       (find-executable-path (find-system-path 'exec-file) c)))
+                (let ([exec (path->complete-path 
+                             (find-executable-path (find-system-path 'exec-file))
+                             (find-system-path 'orig-dir))])
+                  (let-values ([(base name dir?) (split-path exec)])
+                    (path->complete-path c base))))))))
+
+  (define-values (get-config-table)
+    (lambda (d)
+      (let ([p (build-path d "config.rktd")])
+        (or (and (file-exists? p)
+                 (call-with-input-file p read))
+            #hash()))))
+
+  (define-values (coerce-to-path)
+    (lambda (p)
+      (cond
+       [(string? p) (string->path p)]
+       [(bytes? p) (bytes->path p)]
+       [else p])))
+
+  (define-values (add-config-search)
+    (lambda (ht key orig-l)
+      (let ([l (hash-ref ht key #f)])
+        (if l
+            (let loop ([l l])
+              (cond
+               [(null? l) null]
+               [(not (car l)) (append orig-l (loop (cdr l)))]
+               [else (cons (coerce-to-path (car l)) (loop (cdr l)))]))
+            orig-l))))
+
+  (define-values (links-paths) (find-links-path!
+                                ;; This thunk is called once per place, and the result
+                                ;; is remembered for later invocations. Otherwise, the
+                                ;; search for the config file can trip over filesystem
+                                ;; restrictions imposed by security guards.
+                                (lambda ()
+                                  (let* ([d (find-config-dir)]
+                                         [ht (get-config-table d)]
+                                         [lf (or (hash-ref ht 'links-file #f)
+                                                 (build-path (or
+                                                              (coerce-to-path (hash-ref ht 'lib-dir #f))
+                                                              (build-path d 'up "lib"))
+                                                             "links.rktd"))])
+                                    (list->vector
+                                     (add-config-search
+                                      ht
+                                      'links-search-files
+                                      (list lf)))))))
+                                    
+  (define-values (links-caches) (make-vector (vector-length links-paths) (make-hasheq)))
+  (define-values (links-stamps) (make-vector (vector-length links-paths) #f))
 
   (define-values (file->stamp)
     (lambda (path)
@@ -469,7 +514,7 @@
                  (lambda () (close-input-port p)))))))))
 
   (define-values (get-linked-collections)
-    (lambda (user? shared?)
+    (lambda (user? shared? ii)
       (call/ec (lambda (esc)
                  (define-values (make-handler)
                    (lambda (ts)
@@ -477,13 +522,13 @@
                        (if (exn:fail? exn)
                            (let ([l (current-logger)])
                              (when (log-level? l 'error)
-                               (log-message l 'error 
+                               (log-message l 'error
                                             (format
                                              "error reading collection links file ~s: ~a"
                                              (cond
                                               [user? user-links-path]
                                               [shared? shared-links-path]
-                                              [else links-path])
+                                              [else (vector-ref links-paths ii)])
                                              (exn-message exn))
                                             (current-continuation-marks))))
                            (void))
@@ -496,8 +541,8 @@
                            (set! shared-links-cache (make-hasheq))
                            (set! shared-links-stamp ts)]
                           [else
-                           (set! links-cache (make-hasheq))
-                           (set! links-stamp ts)]))
+                           (vector-set! links-caches ii (make-hasheq))
+                           (vector-set! links-stamps ii ts)]))
                        (if (exn:fail? exn)
                            (esc (make-hasheq))
                            ;; re-raise the exception (which is probably a break)
@@ -508,12 +553,12 @@
                    (let* ([a-links-path (cond
                                          [user? user-links-path]
                                          [shared? shared-links-path]
-                                         [else links-path])]
+                                         [else (vector-ref links-paths ii)])]
                           [ts (file->stamp a-links-path)])
                      (if (not (equal? ts (cond
                                           [user? user-links-stamp]
                                           [shared? shared-links-stamp]
-                                          [else links-stamp])))
+                                          [else (vector-ref links-stamps ii)])))
                          (with-continuation-mark
                              exception-handler-key
                              (make-handler ts)
@@ -590,13 +635,13 @@
                                    (set! shared-links-cache ht)
                                    (set! shared-links-stamp ts)]
                                   [else
-                                   (set! links-cache ht)
-                                   (set! links-stamp ts)])
+                                   (vector-set! links-caches ii ht)
+                                   (vector-set! links-stamps ii ts)])
                                  ht))))
                          (cond
                           [user? user-links-cache]
                           [shared? shared-links-cache]
-                          [else links-cache]))))))))
+                          [else (vector-ref links-caches ii)]))))))))
 
   (define-values (normalize-collection-reference)
     (lambda (collection collection-path)
@@ -631,18 +676,22 @@
                             ;; list of paths and (box path)s:
                             (if (and links? (use-user-specific-search-paths))
                                 (append
-                                 (let ([ht (get-linked-collections #t #f)])
+                                 (let ([ht (get-linked-collections #t #f 0)])
                                    (append (hash-ref ht sym null)
                                            (hash-ref ht #f null)))
-                                 (let ([ht (get-linked-collections #f #t)])
+                                 (let ([ht (get-linked-collections #f #t 0)])
                                    (append (hash-ref ht sym null)
                                            (hash-ref ht #f null))))
                                 null)
                             ;; list of paths and (box path)s:
-                            (if (and links? links-path)
-                                (let ([ht (get-linked-collections #f #f)])
-                                  (append (hash-ref ht sym null)
-                                          (hash-ref ht #f null)))
+                            (if links?
+                                (let loop ([ii 0])
+                                  (if (ii . >= . (vector-length links-paths))
+                                      null
+                                      (let ([ht (get-linked-collections #f #f ii)])
+                                        (append (hash-ref ht sym null)
+                                                (hash-ref ht #f null)
+                                                (loop (add1 ii))))))
                                 null)
                             ;; list of paths:
                             (current-library-collection-paths)))])
@@ -795,39 +844,42 @@
      [(extra-collects-dirs) (find-library-collection-paths extra-collects-dirs null)]
      [(extra-collects-dirs post-collects-dirs)
       (let ([user-too? (use-user-specific-search-paths)]
-	    [cons-if (lambda (f r) (if f (cons f r) r))])
-	(path-list-string->path-list
-	 (if user-too?
+            [cons-if (lambda (f r) (if f (cons f r) r))])
+        (path-list-string->path-list
+         (if user-too?
              (let ([c (environment-variables-ref (current-environment-variables)
                                                  #"PLTCOLLECTS")])
                (if c
                    (bytes->string/locale c #\?)
                    ""))
-	     "")
-	 (cons-if
-	  (and user-too?
-	       (build-path (find-system-path 'addon-dir)
-			   (version)
-			   "collects"))
-	  (let loop ([l (append
-			 extra-collects-dirs
-			 (list (find-system-path 'collects-dir))
-                         post-collects-dirs)])
-	    (if (null? l)
-		null
-		(let* ([collects-path (car l)]
-		       [v
-			(cond
-			 [(complete-path? collects-path) collects-path]
-			 [(absolute-path? collects-path)
-			  (path->complete-path collects-path
-					       (find-executable-path (find-system-path 'exec-file) #f #t))]
-			 [else
-			  (find-executable-path (find-system-path 'exec-file) collects-path #t)])])
-		  (if v
-		      (cons (simplify-path (path->complete-path v (current-directory)))
-			    (loop (cdr l)))
-		      (loop (cdr l)))))))))]))
+             "")
+         (add-config-search
+          (get-config-table (find-config-dir))
+          'collects-search-dirs
+          (cons-if
+           (and user-too?
+                (build-path (find-system-path 'addon-dir)
+                            (version)
+                            "collects"))
+           (let loop ([l (append
+                          extra-collects-dirs
+                          (list (find-system-path 'collects-dir))
+                          post-collects-dirs)])
+             (if (null? l)
+                 null
+                 (let* ([collects-path (car l)]
+                        [v
+                         (cond
+                          [(complete-path? collects-path) collects-path]
+                          [(absolute-path? collects-path)
+                           (path->complete-path collects-path
+                                                (find-executable-path (find-system-path 'exec-file) #f #t))]
+                          [else
+                           (find-executable-path (find-system-path 'exec-file) collects-path #t)])])
+                   (if v
+                       (cons (simplify-path (path->complete-path v (current-directory)))
+                             (loop (cdr l)))
+                       (loop (cdr l))))))))))]))
 
   ;; used for the -k command-line argument:
   (define (embedded-load start end str)