I get a warning when doing a make build with Dec 19 11:57GMT source which
seems to be fixed by the trivial:


Index: rip6query.c
===================================================================
RCS file: /cvsroot/basesrc/usr.sbin/rip6query/rip6query.c,v
retrieving revision 1.3
diff -r1.3 rip6query.c
39a40
> #include <errno.h>
60d60
< extern int errno;