anchor.diff:  , buildPythonPackage
   , debugger
   , fetchPypi
  -, isPy3k
   , Mako
  -, makeWrapper
   , packaging
   , pysocks
   , pygments
  
positive.code: , tox
  , unicorn
  , intervaltree
  , fetchpatch
  }:
  
  buildPythonPackage rec {
  
negative.code:   postPatch = ''
      sed -i 's/unicorn>=1.0.2rc1,<1.0.2rc4/unicorn>=1.0.2rc1/' setup.py
    '';
  
    nativeBuildInputs = [
      installShellFiles
    ];
  
    propagatedBuildInputs = [
      Mako
  