anchor.diff:      perlPackages.ListMoreUtils
       perlPackages.LWP
       perlPackages.DBDPg
  -    python
  +    python2
       ruby
       jre
       # tests
  
positive.code:     "DESTDIR=$(out)"
      "PERLLIB=$(out)/${perlPackages.perl.libPrefix}"
      "PERL=${perlPackages.perl.outPath}/bin/perl"
      "PYTHON=${python.outPath}/bin/python"
      "RUBY=${ruby.outPath}/bin/ruby"
      "JAVARUN=${jre.outPath}/bin/java"
      "PLUGINUSER=munin"
  
negative.code: { lib, stdenv, fetchFromGitHub, makeWrapper, which, coreutils, rrdtool, perlPackages
  , python2, ruby, jre, nettools, bc
  }:
  
  stdenv.mkDerivation rec {
  