Prototype warning for clock_nanosleep()

[Joel Sherrill]

Hi

In a build sweep, I noticed that every use of clock_nanosleep()
has a warning for it not being defined. I don't seem to be able
to find the magic to turn on the prototype in time.h. Does
anyone see what needs to be done?

==================
#define _POSIX_C_SOURCE 200112L

#include <time.h>

void f(void)
{
  int rc;

  rc = clock_nanosleep();
}
==================

Thanks.

--joel
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