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