On Irix 6.5 with MIPS cc 7.30 configure refuses to recognize
the existence of "setgroups". 

configure:14453: checking for setgroups
configure:14477: cc -c -g  conftest.c >&5
cc-1020 cc: ERROR File = conftest.c, Line = 159
  The identifier "setgroups" is undefined.

  void* p = setgroups
 ...
1 error detected in the compilation of "conftest.c".
configure:14483: $? = 2
configure: failed program was:
| /* confdefs.h.  */
...
| #include <unistd.h>
| #ifdef HAVE_GRP_H
| #include <grp.h>
| #endif
| 
| int
| main ()
| {
| void* p = setgroups
|   ;
|   return 0;
| }

When I compile a short test program that includes only unistd.h
with cc, it reports no errors.

So I had to manipulate pyconfig.h by hand to force the desired
behaviour. Is this a known issue? Please tell me if I have to
perform other test on my box to solve the issue.