anchor.diff:  { stdenv, fetchurl, fetchFromGitHub, openssl, zlib, pcre, libxml2, libxslt, expat
   , gd, geoip
  +, withStream ? false
   , modules ? []
   , hardening ? true
   }:
  
positive.code:     ++ concatMap (mod: mod.inputs or []) modules;
  
    configureFlags = [
      "--with-select_module"
      "--with-poll_module"
      "--with-threads"
      "--with-http_ssl_module"
      "--with-http_spdy_module"
      "--with-http_realip_module"
      "--with-http_addition_module"
      "--with-http_xslt_module"
  
negative.code:     ''
      ;
  
    postInstall = ''
      mv $out/sbin $out/bin
    '';
  
    meta = {
      description = "A reverse proxy and lightweight webserver";
      homepage    = http://nginx.org;
  