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-rw-r--r--pkgs/development/libraries/boxfort/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/libraries/boxfort/default.nix b/pkgs/development/libraries/boxfort/default.nix
index 95c1afd090f..fb6e735c46e 100644
--- a/pkgs/development/libraries/boxfort/default.nix
+++ b/pkgs/development/libraries/boxfort/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
 
   doCheck = true;
   preCheck = ''
-    export LD_LIBRARY_PATH=`pwd`:$LD_LIBRARY_PATH
+    export LD_LIBRARY_PATH=`pwd`''${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH
   '';
 
   outputs = [ "dev" "out" ];