sys/time.h: no more -ansi timercmp ?

[Dave Morse]

If gcc is invoked with "-ansi" on a file that includes <sys/time.h>, it
doesn't pick up timercmp, but it does pick up gettimeofday.  

In glibc 2.0 (or whatever came on Red Hat 6.2), it did pick it up.
In glibc 2.1 (or whatever came on Woody), its gone.

The man page for gettimeofday hasn't changed.

Could the removal be a mistake?
If its intentional, how should I have figured that out by myself?  :)