anchor.diff:  { stdenv, pkgs, fetchFromGitHub, which, openssh, gcc, gfortran, perl, gnumake
   , mpi ? pkgs.openmpi, openblas, python, tcsh, git, bash, automake, autoconf, libtool, makeWrapper } :
   let
  -  version = "6.8";
  -  versionGA = "5.6.3"; # Fixed by nwchem
  +  version = "6.8.1";
  +  versionGA = "5.6.5"; # Fixed by nwchem
   
     ga_src = fetchFromGitHub {
       owner = "GlobalArrays";
       repo = "ga";
       rev = "v${versionGA}";
  -    sha256 = "0dgrli9rdxffzl0nd3998fbnlnlibx7ahid2v0nhis1r1i71k1dn";
  +    sha256 = "19klm8hqf319pm5mgsw8ma6c7bxbkyzi8l7hlagvfw7qjanm979v";
     };
   
   in stdenv.mkDerivation {
  
positive.code: 
  
        # Overwrite script, skipping the download
        echo -e '#!/bin/sh\n cd ga-5.6.3;autoreconf -ivf' > src/tools/get-tools-github
  
        patchShebangs ./
  
  
negative.code:     enableParallelBuilding = true;
  
      preBuild = ''
        ln -s ${ga_src} src/tools/ga-${versionGA}.tar.gz
  
  
        export NWCHEM_TOP="`pwd`"
  