--- darcs-2.4/darcs.cabal~	2010-02-26 19:10:08.000000000 +0100
+++ darcs-2.4/darcs.cabal	2010-04-10 19:16:10.490059605 +0200
@@ -369,7 +369,7 @@
       buildable: False
 
   if flag(mmap) && !os(windows)
-    build-depends:    mmap >= 0.2
+    build-depends:    mmap >= 0.2 && < 0.5
     cpp-options:      -DHAVE_MMAP
 
   build-depends:    zlib >= 0.5.1.0 && < 0.6.0.0
@@ -491,7 +491,7 @@
       buildable: False
 
   if flag(mmap) && !os(windows)
-    build-depends:    mmap >= 0.2
+    build-depends:    mmap >= 0.2 && < 0.5
     cpp-options:      -DHAVE_MMAP
 
   build-depends:    zlib >= 0.5.1.0 && < 0.6.0.0
@@ -591,7 +591,7 @@
                    random     == 1.0.*
 
   if flag(mmap) && !os(windows)
-    build-depends:    mmap >= 0.2
+    build-depends:    mmap >= 0.2 && < 0.5
     cpp-options:      -DHAVE_MMAP
 
   build-depends:    zlib >= 0.5.1.0 && < 0.6.0.0