anchor.diff:      "--with-ipv6"
       # Install destination problems
       # "--with-http_perl_module"
  -  ] ++ stdenv.lib.optional rtmp "--add-module=${rtmp-ext}"
  -    ++ stdenv.lib.optional fullWebDAV "--add-module=${dav-ext}"
  -    ++ stdenv.lib.optional syslog "--add-module=${syslog-ext}"
  -    ++ stdenv.lib.optional moreheaders "--add-module=${moreheaders-ext}";
  +  ] ++ optional rtmp "--add-module=${rtmp-ext}"
  +    ++ optional fullWebDAV "--add-module=${dav-ext}"
  +    ++ optional syslog "--add-module=${syslog-ext}"
  +    ++ optional moreheaders "--add-module=${moreheaders-ext}"
  +    ++ optional echo "--add-module=${echo-ext}"
  +    ++ optional (elem stdenv.system (with platforms; linux ++ freebsd)) "--with-file-aio";
   
  -  additionalFlags = stdenv.lib.optionalString stdenv.isDarwin "-Wno-error=deprecated-declarations";
  +
  +  additionalFlags = optionalString stdenv.isDarwin "-Wno-error=deprecated-declarations";
   
     preConfigure = ''
       export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I${libxml2}/include/libxml2 $additionalFlags"
  
positive.code:   meta = {
      description = "A reverse proxy and lightweight webserver";
      homepage    = http://nginx.org;
      license     = stdenv.lib.licenses.bsd2;
      platforms   = stdenv.lib.platforms.all;
      maintainers = with stdenv.lib.maintainers; [ thoughtpolice raskin ];
    };
  }
  
negative.code:     rev = "0c6e05d3125a97892a250e9ba8b7674163ba500b";
      sha256 = "e121d97fd3c81c64e6cbf6902bbcbdb01be9ac985c6832d40434379d5e998eaf";
    };
  
    echo-ext = fetchgit {
      url = https://github.com/openresty/echo-nginx-module.git;
      rev = "refs/tags/v0.53";
      sha256 = "90d4e3a49c678019f4f335bc18529aa108fcc9cfe0747ea4e2f6084a70da2868";
    };
  in
  
  stdenv.mkDerivation rec {
  