anchor.diff:  in
   stdenv.mkDerivation rec {
     name = "curl${nameSuffix}-${version}";
  -  version = "7.45.0";
  +  version = "7.46.0";
   
     src = fetchurl {
       url = "http://curl.haxx.se/download/curl-${version}.tar.bz2";
  -    sha256 = "1slq5c0v9wa8hajgimhkxhvsrd07jmih8sa3gjsl597qp5k4w5b5";
  +    sha256 = "1bcm646jgq70mpkwa6n6skff9fzbb4y4liqvzaq6sjzdv36jdmxp";
     };
   
     # Use pkgconfig only when necessary
  -  nativeBuildInputs = [ pkgconfig ];
  +  nativeBuildInputs = [ pkgconfig perl ];
     propagatedBuildInputs = [
       optZlib optOpenssl optLibssh2 optLibnghttp2 optC-ares
       optGss optRtmpdump optOpenldap optLibidn
  
positive.code: { stdenv, fetchurl, pkgconfig
  
  # Optional Dependencies
  , zlib ? null, openssl ? null, libssh2 ? null, libnghttp2 ? null, c-ares ? null
  
negative.code:     (mkWith   (optOpenssl != null)    "ssl"               null)
      (mkWith   false                   "gnutls"            null)
      (mkWith   false                   "polarssl"          null)
      (mkWith   false                   "mbedtls"           null)
      (mkWith   false                   "cyassl"            null)
      (mkWith   false                   "nss"               null)
      (mkWith   false                   "axtls"             null)
      (mkWith   false                   "libpsl"            null)
      (mkWith   false                   "libmetalink"       null)
      #(mkWith   false                   "zsh-functions-dir" null)
      (mkWith   (optLibssh2 != null)    "libssh2"           null)
      (mkWith   (optRtmpdump!= null)    "librtmp"           null)
      (mkEnable false                   "versioned-symbols" null)
  