[ILUG] sched_setaffinity interface change

[P at draigBrady.com]

As can be seen here:
http://sources.redhat.com/cgi-bin/cvsweb.cgi/libc/posix/sched.h?cvsroot=glibc
the sched_setaffinity() interface has changed 3 times:

rh9 = glibc-2.3.2 = int sched_setaffinity(__pid_t __pid, unsigned int 
__len, unsigned long int *__mask);
fc1 = glibc-2.3.3 = int sched_setaffinity(__pid_t __pid, __const 
cpu_set_t *__mask);
fc2 = glibc-cvs   = int sched_setaffinity(__pid_t __pid, size_t 
__cpusetsize, __const cpu_set_t *__cpuset);

Now I would like to write code that can handle all of these
and was wondering whether I could use conditional
compilation, rather than a configure script.

What I've come up with so far is:

#ifdef CPU_SET
     //use glibc-2.3.2 interface
#else
     //any clever way to select between the last 2?
#endif

Please don't say I need a configure script to get
a program to compile on both fc1 and fc2?

thanks,
Pádraig.