'make installworld' fails while upgrading from 9.0-CURRENT to 9.0-RELEASE

[Alexander Shikoff]

Hello All,

I'm unable to complete upgrading 9.0-CURRENT to 9.0-RELEASE from sources.
'make installworld' fails on installing chpass:
[...]
===> usr.bin/chpass (install)
install -s -o root -g wheel -m 4555   chpass /usr/bin
install -o root -g wheel -m 444 chpass.1.gz  /usr/share/man/man1
/usr/share/man/man1/chfn.1.gz -> /usr/share/man/man1/chpass.1.gz
/usr/share/man/man1/chsh.1.gz -> /usr/share/man/man1/chpass.1.gz
/usr/share/man/man1/ypchpass.1.gz -> /usr/share/man/man1/chpass.1.gz
/usr/share/man/man1/ypchfn.1.gz -> /usr/share/man/man1/chpass.1.gz
/usr/share/man/man1/ypchsh.1.gz -> /usr/share/man/man1/chpass.1.gz
/usr/bin/chfn -> /usr/bin/chpass
ln: /usr/bin/chfn: Operation not permitted

It seems that it fails because of schg flag on old chfn, chsh, ypchpass, 
ypchfn, ypchsh binaries. Should I manually remove it? Or there is 
another way to fix an issue? Thanks in advance!

-- 
MINO-RIPE