anchor.diff:      "--enable-nls"
       "--enable-rpath"
       "--disable-fatal-warnings"
  +    "--disable-extra-checks"
       "--disable-debug"
       "--disable-profiling"
       "--disable-valgrind"
  
positive.code:     "--enable-gobject-cast-checks"
      "--enable-glib-asserts"
      (enFlag "orc" (orc != null) null)
      "--disable-static-plugins"
      # Internal plugins
      "--enable-alpha"
  
negative.code:     "--disable-osx_audio"
      "--disable-osx_video"
      (enFlag "gst_v4l2" (v4l_lib != null) null)
      (enFlag "v4l2-probe" (v4l_lib != null) null)
      (enFlag "x" (xorg != null) null)
      (enFlag "aalib" (aalib != null) null)
      "--disable-aalibtest"
      (enFlag "cairo" (cairo != null) null)
  