anchor.diff:  
   let
     compareVersion = v: builtins.compareVersions version v;
  +  qmakeCacheName =
  +    if compareVersion "5.12.4" >= 0 then ".qmake.stash" else ".qmake.cache";
   in
   
   stdenv.mkDerivation {
  
positive.code:         -qmldir $out/$qtQmlPrefix \
          -docdir $out/$qtDocPrefix"
  
      createQmakeCache() {
          cat >>"$1" <<EOF
      NIX_OUTPUT_BIN = $bin
      NIX_OUTPUT_DEV = $dev
      NIX_OUTPUT_OUT = $out
  
negative.code:     }
  
      find . -name '.qmake.conf' | while read conf; do
          qmakeCacheInjectNixOutputs "$(dirname $conf)"
      done
    '';
  
    NIX_CFLAGS_COMPILE =
      [
  