anchor.diff:  #, vo-aacenc
   , vo-amrwbenc ? null
   , wavpack
  -, x11grabExtlib ? false
   , x264
   , x265
   , xavs
  
positive.code:     "--${boolEn (SDL_2 != null)}-sdl"
      "--${boolEn (SDL_2 != null)}-sdl2"
      "--disable-securetransport"
      "--${boolEn x11grabExtlib}-x11grab"
      #"--${boolEn (xorg.libX11 != null && xorg.libXv != null)}-xlib"
      "--${boolEn (zlib != null)}-zlib"
      /*
  
negative.code:   || samba_client != null
    #|| utvideo != null
    || vid-stab != null
    || x264 != null
    || x265 != null
    || xavs != null
  