anchor.diff:      # Make sure cysignals-CSI is in PATH
       export PATH="$out/bin:$PATH"
     '';
  +
  +  buildInputs = lib.optionals pariSupport [
  +    pari
  +  ];
   
     propagatedBuildInputs = [
       cython
  
positive.code:     sha256 = "15nky8siwlc7s8v23vv4m0mnxa1z6jcs2qfr26m2mkw9j9g2na2j";
    };
  
    hardeningDisable = [
      "fortify"
    ];
  
negative.code: , fetchPypi
  , buildPythonPackage
  , cython
  , pariSupport ? true, pari # for interfacing with the PARI/GP signal handler
  }:
  
  assert pariSupport -> pari != null;
  
  buildPythonPackage rec {
    pname = "cysignals";
  