anchor.diff: -{ stdenv, fetchurl, bundlerEnv, ruby }:
  +{ stdenv, fetchurl, bundlerEnv, ruby, makeWrapper }:
   
   let
     version = "4.1.1";
  
positive.code:       sha256 = "1nndy5hz8zvfglxf1f3bsb1pkrfwinfxzkdan1vjs3rkckkszyh5";
      };
  
      buildInputs = [ rubyEnv rubyEnv.wrappedRuby rubyEnv.bundler ];
  
      # taken from https://www.redmine.org/issues/33784
  
negative.code:     '';
  
      installPhase = ''
        mkdir -p $out/bin $out/share
        cp -r . $out/share/redmine
        for i in config files log plugins public/plugin_assets public/themes tmp; do
          rm -rf $out/share/redmine/$i
          ln -fs /run/redmine/$i $out/share/redmine/$i
        done
  
        makeWrapper ${rubyEnv.wrappedRuby}/bin/ruby $out/bin/rdm-mailhandler.rb --add-flags $out/share/redmine/extra/mail_handler/rdm-mailhandler.rb
      '';
  
      meta = with stdenv.lib; {
  