make buildworld errors

[Mike]

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Trying to buildworld but it keeps failing. I finally deleted /usr/src
and recopyed from a cd then cvsup using standard-supfile. Tried
limiting how much ram freebsd uses and only using one stick of ram.
All attempts have failed at the same place.  Would using the GENERIC
kernel make a difference?

#make worldclean && make cleandir
<snip>
#make buildworld
<snip>
===> usr.sbin/ifmcstat (all)
cc -O2 -pipe  -DINET6 -std=gnu99 -fstack-protector -Wsystem-headers
- -Werror -Wall -Wno-format-y2k -Wno-uninitialized -Wno-pointer-sign -c
/usr/src/usr.sbin/ifmcstat/ifmcstat.c
cc1: warnings being treated as errors
/usr/src/usr.bin/ifmcstat/ifmcstat.c:170: warning: 'in6_ifinfo' used
but never defined
*** Error code 1

Stop in /usr/src/usr.sbin/ifmcstat.
*** Error code 1

#uname -a
FreeBSD frogger 8.1-RELEASE-p1 FreeBSD 8.1-RELEASE-p1 #0: Sat Nov 27
02:47:28 CST 2010     alert@:/usr/obj/usr/src/sys/MOLLY  i386
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