anchor.diff:  , cmake
   , doxygen
   , fetchFromGitLab
  -, fetchpatch
   , ffmpeg_3
   , glew
   , gsm
   , intltool
  +, lib
   , libGL
   , libGLU
   , libX11
  
positive.code: , SDL
  , speex
  , srtp
  , lib, stdenv
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:   meta = with lib; {
      description = "A powerful and lightweight streaming engine specialized for voice/video telephony applications";
      homepage = "http://www.linphone.org/technical-corner/mediastreamer2";
      license = licenses.gpl3Only;
      platforms = platforms.linux;
      maintainers = with maintainers; [ jluttine ];
    };
  