追加

cleanvar_enable="YES"
Clean the /var directory

修正

# Emulation/compatibility services provided by /etc/rc.d/abi
sysvipc_enable="NO"
Load System V IPC primitives at startup (or NO).
linux_enable="NO"
Linux binary compatibility loaded at startup (or NO).
svr4_enable="NO"
SysVR4 emulation loaded at startup (or NO).

commit log

Clear up problems with /etc/rc.d/{abi|cleanvar|cleartmp} brought to light by the PR. Specifically, convert these three scripts into good rc.d citizens, making sure that their functionality is preserved, but the rc.d framework rules are not broken.
Add support for cleanvar as a regular rc.d script in the default rc.conf, and document this in the man page.
Add a descriptive comment to rc.conf that regarding the three emulation/compatibility services provided by abi so users will not be confused by these services not having their own startup scripts.

PR
conf/84574
Submitted by
Alexander Botero-Lowry

$FreeBSD: src/etc/defaults/rc.conf,v 1.268 2005/12/19 10:56:59 dougb Exp $
$FreeBSD: src/etc/defaults/rc.conf,v 1.252.2.11 2006/01/17 06:37:48 dougb Exp $