anchor.diff:    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.gpl3;
  +    license = licenses.gpl3Only;
       platforms = platforms.linux;
       maintainers = with maintainers; [ jluttine ];
     };
  
positive.code: , cmake
  , doxygen
  , fetchFromGitLab
  , fetchpatch
  , ffmpeg_3
  , glew
  , gsm
  , intltool
  , libGL
  , libGLU
  , libX11
  
negative.code: , SDL
  , speex
  , srtp
  , stdenv
  }:
  
  stdenv.mkDerivation rec {
  