anchor.diff:  
     # Copy test script into $out and run the test suite.
     checkPhase = ''
  -    python -m numba.runtests
  +    ${python.interpreter} -m numba.runtests
     '';
     # ImportError: cannot import name '_typeconv'
     doCheck = false;
  
positive.code: { stdenv
  , fetchurl
  , python
  , buildPythonPackage
  , isPy27
  
negative.code: }:
  
  buildPythonPackage rec {
    version = "0.36.2";
    pname = "numba";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "d61597808ce511e81b64e32da664f52beb7d947bf834dde8b8b60b29d205e5c2";
    };
  
    NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
  