Fix direnv error when LD_LIBRARY_PATH is initially unset

alpmestan · Aug 6, 2023 · 9faed6a · 9faed6a
1 parent 7d1bf69
commit 9faed6a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ghc.nix b/ghc.nix
@@ -264,7 +264,7 @@ hspkgs.shellFor rec {
 
     # "nix-shell --pure" resets LANG to POSIX, this breaks "make TAGS".
     export LANG="en_US.UTF-8"
-    export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:${lib.makeLibraryPath depsSystem}"
+    export LD_LIBRARY_PATH="''${LD_LIBRARY_PATH:+''${LD_LIBRARY_PATH}:}${lib.makeLibraryPath depsSystem}"
     unset LD
 
     ${lib.optionalString withDocs "export FONTCONFIG_FILE=${fonts}"}