anchor.diff:  { stdenv
   , fetchurl
   , lib
  +, meson
  +, ninja
   , python3
   
   , bzip2
  
positive.code:   };
  
    nativeBuildInputs = [
      python3
    ];
  
  
negative.code:     xorg.libX11
    ];
  
    postPatch = ''
      patchShebangs gst-libs/gst/interfaces/build_mkenum.py
      patchShebangs gst-libs/gst/mpegts/mpegts_enum.py
    '' + /* tests are slower than upstream expects */ ''
      sed -e 's:/\* tcase_set_timeout.*:tcase_set_timeout (tc_chain, 5 * 60);:' \
        -i tests/check/elements/audiomixer.c
    '';
  
    mesonFlags = [
      "-Duse_orc=yes"
      #"-Dwith_gl_api=${if opengl-dummy.glesv2 then "gles2" else "opengl"}"
      "-Dwith_gl_api=opengl"
      "-Dwith_gl_platform=${concatStringsSep "," gl_platforms}"
      "-Ddisable_introspection=false"
    ];
  
    passthru = {
  