anchor.diff:    installPhase = ''
       mkdir $out
       tar xvf build/distributions/mucommander-${version}.tar --directory=$out --strip=1
  -    wrapProgram $out/bin/mucommander --set JAVA_HOME ${jre}
  +    wrapProgram $out/bin/mucommander \
  +      --prefix XDG_DATA_DIRS : ${gsettings-desktop-schemas}/share/gsettings-schemas/${gsettings-desktop-schemas.name} \
  +      --set JAVA_HOME ${jre}
     '';
   
     meta = with stdenv.lib; {
  
positive.code:     rev = version;
      sha256 = "1fvij0yjjz56hsyddznx7mdgq1zm25fkng3axl03iyrij976z7b8";
    };
    
    postPatch = ''
      # there is no .git anyway
      substituteInPlace build.gradle \
  
negative.code: { stdenv, fetchFromGitHub, gradle_3_5, perl, makeWrapper, jre, gsettings-desktop-schemas }:
  
  let
    version = "0.9.2";
  