anchor.diff:  
   let
     name = "scons";
  -  version = "2.0.1";
  +  version = "2.1.0";
   in
   
   stdenv.mkDerivation {
  
positive.code: 
    src = fetchurl {
      url = "mirror://sourceforge/scons/${name}-${version}.tar.gz";
      sha256 = "0qk74nrnm9qlijrq6gmy8cyhjgp0gis4zx44divnr8n487d5308a";
    };
  
    buildInputs = [python makeWrapper];
  
negative.code:     homepage = "http://scons.org/";
      description = "An improved, cross-platform substitute for Make";
      license = "MIT";
      longDescription = ''
        SCons is an Open Source software construction tool. Think of
        SCons as an improved, cross-platform substitute for the classic
        Make utility with integrated functionality similar to
        autoconf/automake and compiler caches such as ccache. In short,
        SCons is an easier, more reliable and faster way to build
        software.
      '';
      platforms = stdenv.lib.platforms.all;
      maintainers = [ stdenv.lib.maintainers.simons ];
  