anchor.diff:      rev = version;
       sha256 = "1fvij0yjjz56hsyddznx7mdgq1zm25fkng3axl03iyrij976z7b8";
     };
  -  
  +
     postPatch = ''
       # there is no .git anyway
       substituteInPlace build.gradle \
  
positive.code: { stdenv, fetchFromGitHub, gradle_3_5, perl, makeWrapper, jre }:
  
  let
    version = "0.9.2";
  
negative.code:   installPhase = ''
      mkdir $out
      tar xvf build/distributions/mucommander-${version}.tar --directory=$out --strip=1
      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; {
  