change ports default work directory prefix

[Kurt Jaeger]

Hi!

> Today in EuroBSDCon's jail working group we discussed changing the
> default for WRKDIRPREFIX to /usr/obj/ports. This has the advantage of
> being able to share the ports tree between host system and jails.
> Another plus is that cleaning all work directories is much faster than a
> recursive make clean.

  portsclean -C

runs really fast and does not use a recursive make clean. It's
part of ports-mgmt/portupgrade-devel.

-- 
pi at opsec.eu            +49 171 3101372                         5 years to go !