5.1-RELEASE buildworld Failure

Hello,

Below is a buildworld failure on a 5.1-RELEASE box with a Generic kernel:

building shared library libkse.so.1
thr_libc.So: In function `sigaction':
thr_libc.So(.text+0x54): multiple definition of `_sigaction'
thr_sigaction.So(.text+0x0): first defined here
thr_libc.So: In function `sigprocmask':
thr_libc.So(.text+0x34): multiple definition of `_sigprocmask'
thr_sigprocmask.So(.text+0x0): first defined here
*** Error code 1

Stop in /usr/src/lib/libpthread.
*** Error code 1

Stop in /usr/src/lib.
*** Error code 1

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

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

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

Stop in /usr/src.


I have cvsup'd from the cvsup2.freebsd.org server and completely blown away
the /usr/obj and /usr/src trees to repeat the process and it's producing the
exact same error.  Any suggestions/comments/fixes/patches are welcome.
Thank you!

Regards,
Nick H.
Network Operations Center
nickh_at_supportteam.net