SCM_RIGHTS on IRIX

["Zow" Terry Brugger <zow pensive llnl gov>]

Good day,
	In order to compile gnome-libs from CVS on IRIX (6.5 - probably others), I 
needed to add:

#define _XOPEN_SOURCE 1

just before:

#include <sys/socket.h>

in zvt/gnome-pty-helper.c . This should either be added to the master copy, or 
to the autoconfig process so others don't have the same problem. Of course, my 
copy is a few days old, so I might be yelling wolf after they already went 
home.

-"Zow"