anchor.diff:  
     installCheckPhase = ''
        #
  -     # Minimal check if installation is runs
  +     # Minimal check if installation runs properly
        #
   
        export MOLCAS_WORKDIR=./
  
positive.code:     sha256 = "0dr5i7b2mklnrcy6y6q9snahbxv2l7s38090my553g5kl5xb3r8x";
    };
  
    nativeBuildInputs = [ perl cmake texLive makeWrapper ];
    buildInputs = [ gfortran openblas hdf5-cpp python ];
  
    cmakeFlags = [
      "-DOPENMP=ON"
      "-DLINALG=OpenBLAS"
      "-DTOOLS=OFF"
      "-DHDF5=ON"
      "-DCTEST=ON"
      "-DOPENBLASROOT=${openblas}"
    ];
  
    postConfigure = ''
      mkdir -p $out/bin
      export PATH=$PATH:$out/bin
  
      echo ${python}
    '';
  
    postFixup = ''
  
negative.code: { stdenv, fetchurl, cmake, gfortran, perl
  , openblas, hdf5-cpp, python3, texLive
  , armadillo
  , makeWrapper, fetchFromGitHub
  } :
  
  let
    version = "master-o180529-0800";
    python = python3.withPackages (ps : with ps; [ six pyparsing ]);
  
    srcLibwfa = fetchFromGitHub {
      owner = "libwfa";
      repo = "libwfa";
      rev = "efd3d5bafd403f945e3ea5bee17d43e150ef78b2";
      sha256 = "0qzs8s0pjrda7icws3f1a55rklfw7b94468ym5zsgp86ikjf2rlz";
    };
  
  
  in stdenv.mkDerivation {
    name = "openmolcas-${version}";
  