Mixed Debian with crappy libc

There is something crappy with my libc development files.
As I was forced to use backported version of Debian packages (something I won’t recommend to anyone), I had some terrible problems that urged me to migrate to Fedora.

There have been security updates in the 2 or three last kernel versions, and I am not being able to easily upgrade due to compilation time errors.

After a make:

CC arch/i386/kernel/process.o
arch/i386/kernel/process.c:505: parse error before `*’
arch/i386/kernel/process.c:506: warning: return-type defaults to `int’
arch/i386/kernel/process.c:506: conflicting types for `__switch_to’
include/asm/system.h:13: previous declaration of `__switch_to’
arch/i386/kernel/process.c: In function `__switch_to’:
arch/i386/kernel/process.c:576: warning: return from incompatible pointer type
make[1]: *** [arch/i386/kernel/process.o] Error 1
make: *** [arch/i386/kernel] Error 2

This is bad. I couldn’t find the cause, although I didn’t have time to further investigate. I am using Debian woody’s libc6-dev, and have tried with many different gcc versions.

Add to that a bunch of other reasons, and I am migrating to Fedora.