struct timeval tv_sec type mismatch ?

on freebsd 5.x and above, the tv_sec field of struct timeval
has type 'long' (defined here:

	http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/sys/_timeval.h

whereas apparently most platform have it as time_t, and i believe
there are standards that require that:

http://www.opengroup.org/onlinepubs/009695399/basedefs/sys/time.h.html

Any reason to keep it as a 'long' ?

The differences between these two types prevents from passing
&tv.tv_sec to functions requiring a time_t * as arguments, which
is apparently a relatively common practice.

cheers
luigi