anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  +, stdenv
  +, libcxx
   }:
   
   buildPythonPackage rec {
  
positive.code:     license = lib.licenses.bsd3;
    };
  
  }
negative.code:     inherit pname version;
      sha256 = "ce3be5d520b4d2c3e5eeb4cd2ef62b9b9ab8ac6b6fedbaa0e39cdb6f50644278";
    };
    
    NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.isDarwin "-I${libcxx}/include/c++/v1";
    
    # Does not include tests
    doCheck = false;
  
  