anchor.diff:  { stdenv, fetchFromGitHub, docutils, python }:
   
   let version = "0.9.0"; in
  -stdenv.mkDerivation {
  +stdenv.mkDerivation rec {
     name = "git-hub-${version}";
   
     src = fetchFromGitHub {
  
positive.code:     # Remove inert ftdetect vim plugin and a README that's a man page subset:
      rm -r $out/share/{doc,vim}
    '';
  }
  
negative.code:     rev = "v${version}";
      repo = "git-hub";
      owner = "sociomantic";
    };
  
    buildInputs = [ python ];
  