The following binaries were built from Netgear's modified sources, they include some optimized ASM routines for the Padre CPU:
  mp42aac
  aac2wav
  alac

Source: http://www.readynas.com/download/GPL/RNR4_RND4_RND2_4.1.6_WW_src.zip

* mp42aac is in the AP4 directory
* aac2wav is in the hxplayer directory
* alac is in the alac_decoder directory

Read the README.INFRANT files in each directory for build instructions.

faad was compiled with:
-DFIXED_POINT -DPADRE -O3
