gcc related -current upgrade problems

hi,

   I'm attempting to upgrade a few month old -current:

FreeBSD 8ball.rtp.freebsd.org. 5.0-CURRENT FreeBSD 5.0-CURRENT #0: Thu Apr 24 23:27:15

rm -rf src obj 
cd /usr
cvs -Rqd /home/ncvs co -P src
cd src
make buildkernel
.
.
.
/usr/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h:62:25: attempt to use poisoned "malloc"
/usr/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h:63:25: attempt to use poisoned "calloc"
/usr/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h:64:25: attempt to use poisoned "realloc"
/usr/src/gnu/usr.bin/cc/cc_tools/freebsd-native.h:65:25: attempt to use poisoned "strdup"
mkdep: compile failed
*** Error code 1

Stop in /usr/src/gnu/usr.bin/cc/cc1plus.
*** Error code 1

Stop in /usr/src/gnu/usr.bin/cc.
*** Error code 1


   This is with a newly checked out /usr/src and empty /usr/obj. UPDATING
only mentions not using -DNOCLEAN and removing obj.

   Any ideas before I sink much more time into this?

Thanks,
John