Can not build 5.1-p10

[Boris Kovalenko]

Hello!

    Have cvsup'ed 5.1-p10 today from cvsup6.ru.freebsd.org and cannot 
build it. make buildworld gives an error:
===> gnu/usr.bin/cc/cc1
rm: /usr/obj/usr/src/gnu/usr.bin/cc/cc1: Directory not empty
*** Error code 1

Stop in /usr/src/gnu/usr.bin/cc/cc1.
*** Error code 1

Stop in /usr/src/gnu/usr.bin/cc.
*** Error code 1

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

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

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

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

Stop in /usr/src.


    May somebody help me?

Yours truly,
    Boris Kovalenko