This is a patched version 1.3.0 of AVRA assembler for the Atmel AVR microcontroller family. It fixes a crash on MacOSX 10.xx (Abort trap: 6), and some compilation warnings.
The original patch can be found at https://sourceforge.net/p/avra/patches/16/
Compiling the source code: cd src && make -f makefiles/Makefile.osx
See the doc directory for more information.