buildworld from FreeBSD 8.1 to FreeBSD 8.2

[hasanhasanli Hasan]

I had problem with upgrating FreeBSD 8.1 to FreeBSD 8.2
after that I typed 
make buildworld
It gives error.
/usr/lib/libthr.a(thr_syscalls.o)(.text+0x87a): In function `___pselect':
: undefined reference to `__pselect'
*** Error code 1 

Stop in /usr/src/cddl/usr.bin/ctfconvert.
*** Error code 1 

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

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

Stop in /usr/src.