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-rw-r--r--pkgs/development/libraries/caf/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/development/libraries/caf/default.nix b/pkgs/development/libraries/caf/default.nix
index ecf991cb59c..e32ec169579 100644
--- a/pkgs/development/libraries/caf/default.nix
+++ b/pkgs/development/libraries/caf/default.nix
@@ -22,8 +22,8 @@ stdenv.mkDerivation rec {
   doCheck = true;
   checkTarget = "test";
   preCheck = ''
-    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD/lib
-    export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:$PWD/lib
+    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}$PWD/lib
+    export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH''${DYLD_LIBRARY_PATH:+:}$PWD/lib
   '';
 
   meta = with stdenv.lib; {