Logged In: YES 
user_id=133413

You have good instincts on what to believe. I was mislead 
because rerunning configure produces a config.log without 
the warnings about resource.h. However running it in a 
freshly openned tar reproduces that warning; and even 
running it twice there (the second time, no warning) 
results in compilation failing at the same place.

So I think you have it - configure takes _any_ gcc warning 
as indicating nonexistence. And I think I see why the 
conflict comes on some systems but not on others. Red Hat 
6.0 sets /usr/include/asm as follows:

asm -> ../src/linux/include/asm/

That directory includes a "resource.h". On this box that 
happens to be code included with kernel 2.4.16, largely 
consisting of a modified definition of RLIM_INFINITY. I'd 
guess if the box still had a 2.2 kernel there would be no 
gcc warning. The whole of that file is:

#ifndef _I386_RESOURCE_H
#define _I386_RESOURCE_H

/*
 * Resource limits
 */

#define RLIMIT_CPU      0               /* CPU time in ms 
*/
#define RLIMIT_FSIZE    1               /* Maximum 
filesize */
#define RLIMIT_DATA     2               /* max data size */
#define RLIMIT_STACK    3               /* max stack size 
*/
#define RLIMIT_CORE     4               /* max core file 
size */
#define RLIMIT_RSS      5               /* max resident 
set size */
#define RLIMIT_NPROC    6               /* max number of 
processes */
#define RLIMIT_NOFILE   7               /* max number of 
open files */
#define RLIMIT_MEMLOCK  8               /* max 
locked-in-memory address space */
#define RLIMIT_AS       9               /* address space 
limit */
#define RLIMIT_LOCKS    10              /* maximum file 
locks held */

#define RLIM_NLIMITS    11

/*
 * SuS says limits have to be unsigned.
 * Which makes a ton more sense anyway.
 */
#define RLIM_INFINITY   (~0UL)

#ifdef __KERNEL__

#define INIT_RLIMITS                                    \
{                                                       \
        { RLIM_INFINITY, RLIM_INFINITY },               \
        { RLIM_INFINITY, RLIM_INFINITY },               \
        { RLIM_INFINITY, RLIM_INFINITY },               \
        {      _STK_LIM, RLIM_INFINITY },               \
        {             0, RLIM_INFINITY },               \
        { RLIM_INFINITY, RLIM_INFINITY },               \
        {             0,             0 },               \
        {      INR_OPEN,     INR_OPEN  },               \
        { RLIM_INFINITY, RLIM_INFINITY },               \
        { RLIM_INFINITY, RLIM_INFINITY },               \
        { RLIM_INFINITY, RLIM_INFINITY },               \
}
 
#endif /* __KERNEL__ */

#endif