anchor.diff:      qtsvg
       speex
       x264
  -    vlc
  +    libvlc
       makeWrapper
       mbedtls
     ]
  
positive.code: 
    postInstall = ''
        wrapProgram $out/bin/obs \
          --prefix "LD_LIBRARY_PATH" : "${xorg.libX11.out}/lib:${vlc}/lib"
    '';
  
    postFixup = stdenv.lib.optionalString stdenv.isLinux ''
  
negative.code: , xorg
  , makeWrapper
  , pkgconfig
  , libvlc
  , mbedtls
  
  , scriptingSupport ? true
  