chkrootkit reports INFECTED :(

[Mikhail E. Zakharov]

Hi!
Running chkrootkit on newly installed FreeBSD 5.0 got:

-cut-
Checking `basename'... not infected
Checking `biff'... not infected
Checking `chfn'... INFECTED
Checking `chsh'... INFECTED
Checking `cron'... not infected
Checking `date'... INFECTED
-cut-
Checking `ls'... INFECTED
-cut-
Checking `ps'... INFECTED
Checking `pstree'... not found
-cut-

What does it mean? Is my system hacked?