gcc: unrecognized option `-pthreads'

I'm seeing "gcc: unrecognized option `-pthreads'" over and over when 
building from cvs tip.

# pg_config --configure
'--prefix=/usr/local/pgsql-8.0' '--with-pgport=55435' '--with-perl' 
'--with-tcl' '--with-tclconfig=/usr/lib' '--without-tk' '--with-python' 
'--enable-nls' '--enable-debug' '--enable-cassert' '--enable-depend' 
'--with-pam' '--enable-integer-datetimes' '--enable-thread-safety' 
'--with-openssl' '--with-krb5' '--with-includes=/usr/include/kerberosIV' 
'--with-includes=/usr/include/et'

# uname -a
Linux jec-linux-lt 2.6.7-1.494.2.2 #1 Tue Aug 3 09:39:58 EDT 2004 i686 
i686 i386 GNU/Linux

Joe