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