anchor.diff:  , pathlib
   , pyacoustid
   , pyechonest
  -, pygobject_3
   , pylast
   , pyxdg
   , pyyaml
  
positive.code:       test/test_replaygain.py
    '';
  
    GST_PLUGIN_PATH = makeSearchPath "lib/gstreamer-1.0" [
      gst-plugins-base
      gst-plugins-good
      #gst-plugins-bad
      #gst-plugins-ugly
    ];
  
    preFixup = ''
      wrapProgram $out/bin/beet \
        --prefix 'GI_TYPELIB_PATH' : "$GI_TYPELIB_PATH" \
        --prefix 'GST_PLUGIN_PATH' : "$GST_PLUGIN_PATH"
    '';
  
    preCheck = ''
      (${concatMapStrings (s: "echo \"${s}\";") allPlugins}) \
        | sort -u > plugins_defined
  
negative.code:     nose
      pyacoustid
      pyechonest
      pylast
      pyxdg
      pyyaml
  