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