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-rw-r--r--pkgs/development/haskell-modules/with-packages-wrapper.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/haskell-modules/with-packages-wrapper.nix b/pkgs/development/haskell-modules/with-packages-wrapper.nix
index 3e8fad712bff..aa0090e4cff5 100644
--- a/pkgs/development/haskell-modules/with-packages-wrapper.nix
+++ b/pkgs/development/haskell-modules/with-packages-wrapper.nix
@@ -104,7 +104,7 @@ symlinkJoin {
     # Clean up the old links that may have been (transitively) included by
     # symlinkJoin:
     rm -f $dynamicLinksDir/*
-    for d in $(grep dynamic-library-dirs $packageConfDir/*|awk '{print $2}'); do
+    for d in $(grep dynamic-library-dirs $packageConfDir/*|awk '{print $2}'|sort -u); do
       ln -s $d/*.dylib $dynamicLinksDir
     done
     for f in $packageConfDir/*.conf; do