anchor.diff:      license = licenses.gpl2Plus;
       maintainers = with maintainers; [ ertes AndersonTorres ] ++ teams.sage.members;
       platforms = platforms.linux ++ platforms.darwin;
  +    mainProgram = "gp";
     };
   }
  
positive.code:       # old versions are at the url below
        "https://pari.math.u-bordeaux.fr/pub/pari/OLD/${lib.versions.majorMinor version}/${pname}-${version}.tar.gz"
      ];
      hash = "sha256-zLp/FgbGhU8UQ2N7tXrQlY1Bx/R1P4roRZ8dZMJnoco=";
    };
  
    buildInputs = [
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "pari";
    version = "2.13.4";
  
    src = fetchurl {
      urls = [
  