_POSIX_C_SOURCE question

[Stephen J. Roznowski]

When compiling XFree86-4-libraries, I get the following warning:

  /usr/include/sys/cdefs.h:273: warning: `_POSIX_C_SOURCE' is not defined
  /usr/include/sys/cdefs.h:279: warning: `_POSIX_C_SOURCE' is not defined

Should this section of cdefs.h be wrapped with a

	#ifdef _POSIX_C_SOURCE
	#endif

section?

Thanks,
-- 
Stephen J. Roznowski    (sjr at comcast.net)