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