anchor.diff:      "--enable-realmedia"
       # External plugins
       (enFlag "a52dec" (a52dec != null) null)
  -    (enFlag "amrnb" (amrnb != null) null)
  -    (enFlag "amrwb" (amrnb != null) null)
  +    #(enFlag "amrnb" (amrnb != null) null)
  +    #(enFlag "amrwb" (amrnb != null) null)
       (enFlag "cdio" (libcdio != null) null)
       (enFlag "dvdread" (libdvdread != null) null)
       (enFlag "lame" (lame != null) null)
       (enFlag "mad" (libmad != null) null)
  -    (enFlag "mpeg2dec" (mpeg2dec != null) null)
  +    (enFlag "mpeg2dec" (libmpeg2 != null) null)
       #(enFlag "sidplay" (sidplay != null) null)
       #(enFlag "twolame" (twolame != null) null)
       (enFlag "x264" (x264 != null) null)
  
positive.code: 
    buildInputs = [
      a52dec
      amrnb
      amrwb
      glib
      gst-plugins-base
      gstreamer
  
negative.code: , python
  
  , a52dec
  #, amrnb
  #, amrwb
  , glib
  , gst-plugins-base
  , gstreamer
  