Portsclean doesnt like my upgrade from 6.3 > 7.0

[David Southwell]

It looks as though I have missed something!!
FreeBSD dns1.vizion2000.net 7.0-STABLE FreeBSD 7.0-STABLE #0: Wed Jul 16 
09:27:38 PDT 2008     root at dns1.vizion2000.net:/usr/obj/usr/src/sys/GENERIC  
amd64

[root at dns1 ~]# portsclean
FFaattaall  eerrrroorr  ''Thread is not system scope.
Thread is not system scope.
''  aatt  lliinnee  331199  iinn  
ffiillee  /usr/src/lib/libpthread/thread/thr_sig.c/usr/src/lib/libpthread/thread/thr_sig.c  
((eerrrrnnoo  ==  22))

Segmentation fault: 11 (core dumped)

Ok where do I go from here??

David