anchor.diff: -{ lib, fetchurl, pythonPackages
  +{ lib, fetchurl, python2Packages
   , gnutar, unzip, lhasa, rpm, binutils, cpio, gzip, p7zip, cabextract, unrar, unshield
   , bzip2, xz, lzip
   # unzip is handled by p7zip
  
positive.code:     wrapProgram "$out/bin/dtrx" --prefix PATH : "${archivers}"
    '';
  
    meta = with lib; {
      description = "Do The Right Extraction: A tool for taking the hassle out of extracting archives";
      homepage = "https://brettcsmith.org/2007/dtrx/";
  
negative.code:   ++ lib.optional (unrarSupport) unrar
    ++ [ bzip2 xz lzip ]);
  
  in python2Packages.buildPythonApplication rec {
    pname = "dtrx";
    version = "7.1";
  
  