I think that, lacking documentation of the library calls, it could be worthwhile to keep a thread specific to discuss the libraries and, when it comes, example of its use.

they are in usr/local/arm/oe/arm-linux/include/

liberipc and liberdm are perhaps the more critical/important ones.

I've figured out the calls from ipdf, I'll be building an idjvu as a proof of tool chain project.

I'll heavily comment idjvu, see my lightly commented Java source as an example of when I lightly comment. :)