anchor.diff:      glib
       gobject-introspection
       gnutls
  -    gst-plugins-bad
       gst-plugins-base
       gstreamer
       gtk2
  
positive.code:     # TODO: add gstreamer mpeg-ts support
      (cmFlag "USE_GSTREAMER_MPEGTS" false)
      # TODO: add gstreamer GL support
      (cmFlag "USE_GSTREAMER_GL" (gstreamer != null && gst-plugins-base != null))
      (cmFlag "ENABLE_X11_TARGET" (xorg.libX11 != null))
      # TODO: add wayland support (linker errors)
      (cmFlag "ENABLE_WAYLAND_TARGET" (wayland != null))
  
negative.code: , glib
  , gobject-introspection
  , gnutls
  , gst-plugins-base
  , gstreamer
  , gtk2
  