Looks like there are some fairly recent RPMS here:
I've never used any of these specifically since I use FreeBSD Unix.
If you use FreeBSD Unix, you can install your complete AVR development environment which includes the gcc compiler, libc, program download support (avrdude), and JTAGICE support under gdb very simply as follows:
% cd /usr/ports/devel/avr-gcc && make install % cd /usr/ports/devel/avr-libc && make install % cd /usr/ports/devel/avrdude && make install % cd /usr/ports/devel/avr-gdb && make install % cd /usr/ports/devel/avarice && make install
Cheers,
-Brian