anchor.diff:      homepage = "https://github.com/symengine/symengine.py";
       license = licenses.mit;
       maintainers = [ maintainers.costrouc ];
  -    broken = true;
     };
   }
  
positive.code:       --replace "SET(CYTHON_BIN cython" "SET(CYTHON_BIN ${cython}/bin/cython"
    '';
  
    buildInputs = [ cython cmake ];
  
    checkInputs = [ pytest sympy ];
  
  
negative.code: 
  buildPythonPackage rec {
    pname = "symengine";
    version = "0.6.1";
  
    src = fetchFromGitHub {
      owner = "symengine";
      repo = "symengine.py";
      rev = "v${version}";
      sha256 = "13fy25qxn4xwzlr2w35v6jhlpd70lv9r6srv4dizc4brj63hnw50";
    };
  
    postConfigure = ''
  