I've had a similar problem with 4.3. Someone in this list resolved my problem updating cvsup to the latest version, rm -rf /usr/src and cvsup'ing again from 0.
It was some type of a bug related to files dated with 1 billion seconds (or minutes, don't know). []'s To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-stable" in the body of the message
