anchor.diff:  { stdenv, fetchFromGitHub, skalibs, gcc }:
   
   with stdenv.lib;
  +let
  +  cross = "";
  +in
   
   stdenv.mkDerivation rec {
     name = "s6-portable-utils-${version}";
  
positive.code:   
    nativeBuildInputs = []
      ++ optional stdenv.isDarwin gcc;
      
    configureFlags = [
      "--with-sysdeps=${skalibs}/lib/skalibs/sysdeps"
      "--with-include=${skalibs}/include"
  
negative.code:     "--with-dynlib=${skalibs}/lib"
    ]
    ++ (optional stdenv.isDarwin "--target=${stdenv.system}")
    ;
    meta = {
      homepage = http://www.skarnet.org/software/s6-portable-utils/;
      description = "A set of tiny general Unix utilities optimized for simplicity and small size";
  