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-rw-r--r--pkgs/applications/window-managers/xmonad/xmonad-contrib.nix3
1 files changed, 3 insertions, 0 deletions
diff --git a/pkgs/applications/window-managers/xmonad/xmonad-contrib.nix b/pkgs/applications/window-managers/xmonad/xmonad-contrib.nix
index 5c00ddf0fd1..8eedafb94c7 100644
--- a/pkgs/applications/window-managers/xmonad/xmonad-contrib.nix
+++ b/pkgs/applications/window-managers/xmonad/xmonad-contrib.nix
@@ -9,6 +9,9 @@ cabal.mkDerivation (self: {
   buildDepends = [
     extensibleExceptions mtl random utf8String X11 X11Xft xmonad
   ];
+  patchPhase = self.stdenv.lib.optional (self.stdenv.lib.versionOlder "7.8" self.ghc.version) ''
+    sed -i -e 's|ForeignFunctionInterface|AllowAmbiguousTypes, ForeignFunctionInterface|' xmonad-contrib.cabal
+  '';
   meta = {
     homepage = "http://xmonad.org/";
     description = "Third party extensions for xmonad";