anchor.diff:  { stdenv, fetchurl, fetchpatch, pkgconfig, libpng, openssl, curl, gtk2, check, SDL
  -, libxml2, libidn, perl, nettools, perlPackages, xxd
   , libXcursor, libXrandr, makeWrapper
   , libwebp
  +, libxml2, libidn, perl, perlPackages, xxd
   , uilib ? "framebuffer"
  -, buildsystem
   , nsgenbind
   , libnsfb
   , libwapcaplet
  
positive.code: 
    makeFlags = [
      "PREFIX=$(out)"
      "NSSHARED=${buildsystem}/share/netsurf-buildsystem"
      "TARGET=${uilib}"
    ];
  
  
negative.code:   name = "netsurf-${version}";
    version = "3.9";
  
    src = fetchurl {
      url = "http://download.netsurf-browser.org/netsurf/releases/source/netsurf-${version}-src.tar.gz";
      sha256 = "1hzcm2s2wh5sapgr000lg63hcdbj6hyajxl43xa1x80kc5piqbyp";
  