anchor.diff:      checkPhase = ''
         ${self.python.executable} runtests.py
       '';
  -    
  +
       meta = {
         description = "A lightweight LLVM python binding for writing JIT compilers";
         homepage = "http://llvmlite.pydata.org/";
  
positive.code: 
      # there ain't none
      doCheck = false;
      
      meta = {
        description = "Mercurial extension for selecting graphically which files/hunk/lines to commit";
        homepage = https://bitbucket.org/edgimar/crecord;
  
negative.code:   numba = buildPythonPackage rec {
      version = "0.21.0";
      name = "numba-${version}";
  
      src = pkgs.fetchurl {
        url = "https://pypi.python.org/packages/source/n/numba/${name}.tar.gz";
        sha256 = "1806d2f6ad49ad891e9ac6fed0cc0b0489cbfcd9ba2dc81081c1c30091e77604";
      };
  
      propagatedBuildInputs = with self; [numpy llvmlite argparse] ++ optional (!isPy3k) funcsigs ++ optional (isPy27 || isPy33) singledispatch;
      # Future work: add Cuda support.
      #propagatedBuildInputs = with self; [numpy llvmlite argparse pkgs.cudatoolkit6];
  