coq: Fix setup hook

5 years ago · d60532bc71
parent 6e38def213
commit d60532bc71
1 changed files with 1 additions and 1 deletions
--- a/pkgs/applications/science/logic/coq/default.nix
+++ b/pkgs/applications/science/logic/coq/default.nix
@ -124,7 +124,7 @@ self = stdenv.mkDerivation {
  setupHook = writeText "setupHook.sh" ''
    addCoqPath () {
      if test -d "''$1/lib/coq/${coq-version}/user-contrib"; then
-        export COQPATH="''${COQPATH}''${COQPATH:+:}''$1/lib/coq/${coq-version}/user-contrib/"
+        export COQPATH="''${COQPATH-}''${COQPATH:+:}''$1/lib/coq/${coq-version}/user-contrib/"
      fi
    }