openjdk 12: fix possibly-unbound JAVA_HOME

as done in 373236ccff for all other uses
2020-03-21 22:45:14 -04:00 · 2020-03-21 22:45:14 -04:00 · 7b7cb7b876
commit 7b7cb7b876
parent 8ff99ba57e
1 changed files with 1 additions and 1 deletions
--- a/pkgs/development/compilers/openjdk/12.nix
+++ b/pkgs/development/compilers/openjdk/12.nix
@ -114,7 +114,7 @@ let
      # Set JAVA_HOME automatically.
      mkdir -p $out/nix-support
      cat <<EOF > $out/nix-support/setup-hook
-      if [ -z "\$JAVA_HOME" ]; then export JAVA_HOME=$out/lib/openjdk; fi
+      if [ -z "\''${JAVA_HOME-}" ]; then export JAVA_HOME=$out/lib/openjdk; fi
      EOF
    '';