I tested and removed inttypes.h in trx/trx.c. Recompiling gives an error message about parse error before debug-message PRIu32 on line 69 in trx/trx.c.
PRIu32 is AFAIK the proper way of printing a uint32_t without generating a warning and without making assumptions about the platform.
inttypes.h is a standard C99 header file, if you distribution doesn't have it, I would suggest reporting the bug to them.
As was pointed out to me, it's the trx.c file from the firmware and not the one from the host app, so the bug should go to the cross toolchain provider I guess.
That printf is definitely not a "key-functionality" so you can just remote it, however, I would expect that while fixing other GCC warnings, the use of inttypes.h will rise in the future, so I'd suggest you get a good toolchain. See http://bb.osmocom.org/trac/wiki/GnuArmToolchain for how to build one.
Cheers,
Sylvain