anchor.diff:      "--disable-gtk-doc-pdf"
       "--enable-nls"
       "--enable-rpath"
  -    "--enable-introspection"
  +    (enFlag "introspection" (gobject-introspection != null) null)
       "--with-x"
     ];
   
  
positive.code: , gdk-pixbuf
  , glib
  , gobject-introspection
  , gst_all_1
  , json-glib
  , libdrm
  , libxkbcommon
  
negative.code:     gdk-pixbuf
      glib
      gobject-introspection
      gst-plugins-base
      gstreamer
      json-glib
      libdrm
      libxkbcommon
  