diff --git a/pkgs/compatibility-pkgs/compatibility-lib/info.rkt b/pkgs/compatibility-pkgs/compatibility-lib/info.rkt
index 117849a284..c6da929d41 100644
--- a/pkgs/compatibility-pkgs/compatibility-lib/info.rkt
+++ b/pkgs/compatibility-pkgs/compatibility-lib/info.rkt
@@ -1,3 +1,5 @@
 #lang info
 (define collection 'multi)
-(define deps '("base" "net-lib"))
+(define deps '("base" 
+               "net-lib"
+               "sandbox-lib"))
diff --git a/pkgs/lazy/mz-without-promises.rkt b/pkgs/compatibility-pkgs/compatibility-lib/lazy/mz-without-promises.rkt
similarity index 100%
rename from pkgs/lazy/mz-without-promises.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/lazy/mz-without-promises.rkt
diff --git a/racket/lib/collects/mzlib/private/sigmatch.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/private/sigmatch.rkt
similarity index 100%
rename from racket/lib/collects/mzlib/private/sigmatch.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzlib/private/sigmatch.rkt
diff --git a/racket/lib/collects/mzlib/private/sigutil.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/private/sigutil.rkt
similarity index 100%
rename from racket/lib/collects/mzlib/private/sigutil.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzlib/private/sigutil.rkt
diff --git a/racket/lib/collects/mzlib/private/unitidmap.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/private/unitidmap.rkt
similarity index 100%
rename from racket/lib/collects/mzlib/private/unitidmap.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzlib/private/unitidmap.rkt
diff --git a/pkgs/sandbox-lib/mzlib/sandbox.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/sandbox.rkt
similarity index 100%
rename from pkgs/sandbox-lib/mzlib/sandbox.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzlib/sandbox.rkt
diff --git a/racket/lib/collects/mzlib/unit200.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/unit200.rkt
similarity index 100%
rename from racket/lib/collects/mzlib/unit200.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzlib/unit200.rkt
diff --git a/racket/lib/collects/mzlib/unitsig200.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzlib/unitsig200.rkt
similarity index 100%
rename from racket/lib/collects/mzlib/unitsig200.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzlib/unitsig200.rkt
diff --git a/racket/lib/collects/mzscheme/lang/reader.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzscheme/lang/reader.rkt
similarity index 100%
rename from racket/lib/collects/mzscheme/lang/reader.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzscheme/lang/reader.rkt
diff --git a/racket/lib/collects/mzscheme/main.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzscheme/main.rkt
similarity index 100%
rename from racket/lib/collects/mzscheme/main.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzscheme/main.rkt
diff --git a/racket/lib/collects/mzscheme/private/old-ds.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-ds.rkt
similarity index 100%
rename from racket/lib/collects/mzscheme/private/old-ds.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-ds.rkt
diff --git a/racket/lib/collects/mzscheme/private/old-if.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-if.rkt
similarity index 100%
rename from racket/lib/collects/mzscheme/private/old-if.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-if.rkt
diff --git a/racket/lib/collects/mzscheme/private/old-procs.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-procs.rkt
similarity index 100%
rename from racket/lib/collects/mzscheme/private/old-procs.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-procs.rkt
diff --git a/racket/lib/collects/mzscheme/private/old-rp.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-rp.rkt
similarity index 100%
rename from racket/lib/collects/mzscheme/private/old-rp.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/old-rp.rkt
diff --git a/racket/lib/collects/mzscheme/private/stxmz-body.rkt b/pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/stxmz-body.rkt
similarity index 100%
rename from racket/lib/collects/mzscheme/private/stxmz-body.rkt
rename to pkgs/compatibility-pkgs/compatibility-lib/mzscheme/private/stxmz-body.rkt
diff --git a/pkgs/errortrace-pkgs/errortrace-lib/errortrace/zo-compile.rkt b/pkgs/errortrace-pkgs/errortrace-lib/errortrace/zo-compile.rkt
index 58ccfbc19b..d654336d24 100644
--- a/pkgs/errortrace-pkgs/errortrace-lib/errortrace/zo-compile.rkt
+++ b/pkgs/errortrace-pkgs/errortrace-lib/errortrace/zo-compile.rkt
@@ -1,4 +1,4 @@
-(module zo-compile mzscheme
+(module zo-compile racket/base
   (require "errortrace-lib.rkt")
   
   (provide zo-compile)
diff --git a/pkgs/gui-pkgs/gui-test/info.rkt b/pkgs/gui-pkgs/gui-test/info.rkt
index 7969cc6c07..da96c24258 100644
--- a/pkgs/gui-pkgs/gui-test/info.rkt
+++ b/pkgs/gui-pkgs/gui-test/info.rkt
@@ -6,5 +6,6 @@
                "gui-lib"
                "rackunit-lib"
                "scribble-lib"
-               "pconvert-lib"))
+               "pconvert-lib"
+               "compatibility-lib"))
 (define build-deps '())
diff --git a/pkgs/lazy/info.rkt b/pkgs/lazy/info.rkt
index ce7593b7af..54cc149051 100644
--- a/pkgs/lazy/info.rkt
+++ b/pkgs/lazy/info.rkt
@@ -22,5 +22,6 @@
 (define deps '("base"
                "drracket"
                "htdp"
-               "string-constants-lib"))
+               "string-constants-lib"
+               "compatibility-lib"))
 (define build-deps '("scribble-lib"))
diff --git a/pkgs/srfi-pkgs/srfi-doc/info.rkt b/pkgs/srfi-pkgs/srfi-doc/info.rkt
index 4e039efe9b..74e1c76d25 100644
--- a/pkgs/srfi-pkgs/srfi-doc/info.rkt
+++ b/pkgs/srfi-pkgs/srfi-doc/info.rkt
@@ -7,4 +7,5 @@
                      "srfi-lib"
                      "racket-doc"
                      "r5rs-doc"
-                     "r6rs-doc"))
+                     "r6rs-doc"
+                     "compatibility-lib"))