If you are going to use either of AH or ESP or both, enable these in
/etc/sysctl.conf.  Also correct the IPSec debugging sysctl code, it is now
named net.inet.ip.encdebug.  Some corrected function signatures too.

example.
Submitted by: MALCOLM BOFF <Malcolm_Boff@compuserve.com>

up [options]
Any of the following may or may not be set:
$name $mask $bcaddr $extras

to change it if they so desire

pre-2.2 series.

This avoids creating of incorrect symlink ${HOME}/sys -> usr/src/sys when
DESTDIR="".