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-rw-r--r--pkgs/development/compilers/mlton/20130715.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/compilers/mlton/20130715.nix b/pkgs/development/compilers/mlton/20130715.nix
index 207ed8f29bc..52bb0a0775c 100644
--- a/pkgs/development/compilers/mlton/20130715.nix
+++ b/pkgs/development/compilers/mlton/20130715.nix
@@ -77,7 +77,7 @@ stdenv.mkDerivation rec {
     chmod u+x $(pwd)/../${usr_prefix}/bin/mlton
 
     # So the builder runs the binary compiler with gmp.
-    export LD_LIBRARY_PATH=${gmp.out}/lib:$LD_LIBRARY_PATH
+    export LD_LIBRARY_PATH=${gmp.out}/lib''${LD_LIBRARY_PATH:+:}$LD_LIBRARY_PATH
 
   '' + stdenv.lib.optionalString stdenv.isLinux ''
     # Patch ELF interpreter.