anchor.diff:      sha256 = "15nky8siwlc7s8v23vv4m0mnxa1z6jcs2qfr26m2mkw9j9g2na2j";
     };
   
  +  # explicit check:
  +  # build/src/cysignals/implementation.c:27:2: error: #error "cysignals must be compiled without _FORTIFY_SOURCE"
     hardeningDisable = [
       "fortify"
     ];
  
positive.code:     # Make sure cysignals-CSI is in PATH
      export PATH="$out/bin:$PATH"
    '';
  
    propagatedBuildInputs = [
      cython
  
negative.code: , fetchPypi
  , buildPythonPackage
  , cython
  , pariSupport ? true, pari # for interfacing with the PARI/GP signal handler
  }:
  
  assert pariSupport -> pari != null;
  
  buildPythonPackage rec {
    pname = "cysignals";
  