anchor.diff:  { lib, stdenv, fetchFromGitLab, cmake, gfortran, perl }:
   
   let
  -  version = "5.1.2";
  +  version = "5.1.3";
   
   in stdenv.mkDerivation {
     pname = "libxc";
  
positive.code:   '';
  
    doCheck = true;
    enableParallelBuilding = true;
  
    meta = with lib; {
      description = "Library of exchange-correlation functionals for density-functional theory";
  
negative.code:     owner = "libxc";
      repo = "libxc";
      rev = version;
      sha256 = "14czspifznsmvvix5hcm1rk18iy590qk8p5m00p0y032gmn9i2zj";
    };
  
    buildInputs = [ gfortran ];
  