anchor.diff:    gitLabRev = "dd982ad4bc94dec8ac1e3e99cb6a7dd249ff71de";
   
     python = python3.withPackages (ps : with ps; [ six pyparsing ]);
  -
  -  srcLibwfa = fetchFromGitHub {
  -    owner = "libwfa";
  -    repo = "libwfa";
  -    rev = "efd3d5bafd403f945e3ea5bee17d43e150ef78b2";
  -    sha256 = "0qzs8s0pjrda7icws3f1a55rklfw7b94468ym5zsgp86ikjf2rlz";
  -  };
   
   in stdenv.mkDerivation {
     pname = "openmolcas";
  
positive.code: { lib, stdenv, pkgs, fetchFromGitLab, fetchpatch, cmake, gfortran, perl
  , blas-i8, hdf5-full, python3, texlive
  , armadillo, makeWrapper, fetchFromGitHub, chemps2
  } :
  
  assert
  
negative.code: 
    prePatch = ''
      rm -r External/libwfa
      cp -r ${libwfa.src} External/libwfa
      chmod -R u+w External/
    '';
  
  