diff --git a/distro-build-server/info.rkt b/distro-build-server/info.rkt
index 8acdb56..1eb141f 100644
--- a/distro-build-server/info.rkt
+++ b/distro-build-server/info.rkt
@@ -2,7 +2,7 @@
 
 (define collection "distro-build")
 
-(define deps '("base"
+(define deps '(["base" #:version "6.1.1.6"]
                "distro-build-client"
                "web-server-lib"
                "ds-store-lib"
diff --git a/distro-build-server/pack-built.rkt b/distro-build-server/pack-built.rkt
index 1914ef5..ddafc27 100644
--- a/distro-build-server/pack-built.rkt
+++ b/distro-build-server/pack-built.rkt
@@ -7,7 +7,8 @@
          racket/file
          racket/path
          openssl/sha1
-         racket/cmdline)
+         racket/cmdline
+         setup/getinfo)
 
 (module test racket/base)
 
@@ -23,7 +24,6 @@
 
 (define build-dir "build")
 (define dest-dir (build-path build-dir (~a create-mode)))
-(define native-dir (build-path build-dir "native" "pkgs"))
 (define pkg-dest-dir (path->complete-path (build-path dest-dir "pkgs")))
 (define catalog-dir (build-path dest-dir "catalog"))
 (define catalog-pkg-dir (build-path catalog-dir "pkg"))
@@ -32,28 +32,41 @@
 
 (define pkg-details (call-with-input-file* pkg-info-file read))
 
+(define pkg-cache (make-hash))
+
+(define (prefer-binary? pkg)
+  (define dir (pkg-directory pkg #:cache pkg-cache))
+  (define i (get-info/full dir))
+  (define mode (and i (i 'distribution-preference (lambda () #f))))
+  (or (eq? mode 'binary)
+      ;; Any ".rkt" or ".scrbl" other than "info.rkt"?
+      (not (for/or ([f (in-directory dir)])
+             (and (regexp-match? #rx"[.](scrbl|rkt)$" f)
+                  (not (let-values ([(base name dir?) (split-path f)])
+                         (equal? #"info.rkt" (path->bytes name)))))))))
+   
 (for ([pkg (in-list (installed-pkg-names))])
-  (define native-zip (build-path native-dir (path-add-suffix pkg ".zip")))
-  (unless (file-exists? native-zip)
-    (define ht (hash-ref pkg-details pkg (hash)))
-    (define dest-zip (build-path pkg-dest-dir (~a pkg ".zip")))
-    (pkg-create 'zip pkg
-                #:source 'name
-                #:dest pkg-dest-dir
-                #:mode create-mode)
-    (call-with-output-file*
-     (build-path catalog-pkg-dir pkg)
-     #:exists 'truncate
-     (lambda (o)
-       (write (hash 'source (path->string (find-relative-path
-                                           (simple-form-path catalog-dir)
-                                           (simple-form-path dest-zip)))
-                    'checksum (call-with-input-file* dest-zip sha1)
-                    'name pkg
-                    'author (hash-ref ht 'author "plt@racket-lang.org")
-                    'description (hash-ref ht 'author "library")
-                    'tags (hash-ref ht 'tags '())
-                    'dependencies (hash-ref ht 'dependencies '())
-                    'modules (hash-ref ht 'modules '()))
-              o)
-       (newline o)))))
+  (define ht (hash-ref pkg-details pkg (hash)))
+  (define dest-zip (build-path pkg-dest-dir (~a pkg ".zip")))
+  (pkg-create 'zip pkg
+              #:source 'name
+              #:dest pkg-dest-dir
+              #:mode (if (prefer-binary? pkg)
+                         'binary
+                         create-mode))
+  (call-with-output-file*
+   (build-path catalog-pkg-dir pkg)
+   #:exists 'truncate
+   (lambda (o)
+     (write (hash 'source (path->string (find-relative-path
+                                         (simple-form-path catalog-dir)
+                                         (simple-form-path dest-zip)))
+                  'checksum (call-with-input-file* dest-zip sha1)
+                  'name pkg
+                  'author (hash-ref ht 'author "plt@racket-lang.org")
+                  'description (hash-ref ht 'author "library")
+                  'tags (hash-ref ht 'tags '())
+                  'dependencies (hash-ref ht 'dependencies '())
+                  'modules (hash-ref ht 'modules '()))
+            o)
+     (newline o))))
diff --git a/distro-build-server/serve-catalog.rkt b/distro-build-server/serve-catalog.rkt
index 3e36907..4810a4c 100644
--- a/distro-build-server/serve-catalog.rkt
+++ b/distro-build-server/serve-catalog.rkt
@@ -42,9 +42,8 @@
 
 (define build-dir (path->complete-path "build"))
 (define built-dir (build-path build-dir from-dir))
-(define native-dir (build-path build-dir "native"))
 
-(define dirs (list built-dir native-dir))
+(define dirs (list built-dir))
 
 (define (pkg-name->info req name)
   (for/or ([d (in-list dirs)])