anchor.diff:    configureFlags = [
       "--enable-ldap"
       "--with-ffmpeg=${ffmpeg.dev}"
  -    "--with-polarssl=${polarssl}"
  -    "--enable-lime"
       "--enable-external-ortp"
       "--enable-external-mediastreamer"
     ];
  
positive.code: { stdenv, fetchurl, intltool, pkgconfig, readline, openldap, cyrus_sasl, libupnp
  , zlib, libxml2, gtk2, libnotify, speex, ffmpeg, libX11, polarssl, libsoup, udev
  , ortp, mediastreamer, sqlite, belle-sip, libosip, libexosip
  , mediastreamer-openh264, makeWrapper
  }:
  
negative.code: 
    buildInputs = [
      readline openldap cyrus_sasl libupnp zlib libxml2 gtk2 libnotify speex ffmpeg libX11
      libsoup udev ortp mediastreamer sqlite belle-sip libosip libexosip
    ];
  
    nativeBuildInputs = [ intltool pkgconfig makeWrapper ];
  