1 files changed, 11 insertions, 2 deletions
diff --git a/pkgs/development/libraries/zlib/default.nix b/pkgs/development/libraries/zlib/default.nix
index 3db3ad449c1..706c74b6ce6 100644
--- a/pkgs/development/libraries/zlib/default.nix
+++ b/pkgs/development/libraries/zlib/default.nix
@@ -2,7 +2,7 @@
 
 let version = "1.2.8"; in
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (rec {
   name = "zlib-${version}";
 
   src = fetchurl {
@@ -55,4 +55,13 @@ stdenv.mkDerivation rec {
     description = "Lossless data-compression library";
     license = licenses.zlib;
   };
-}
+} // (if stdenv.isDarwin then {
+  postInstall = ''
+    # jww (2015-01-06): Sometimes this library install as a .so, even on
+    # Darwin; others time it installs as a .dylib.  I haven't yet figured out
+    # what causes this difference.
+    for file in $out/lib/*.so* $out/lib/*.dylib* ; do
+      install_name_tool -id "$file" $file
+    done
+  '';
+} else {}))