unexec ${DIRRM} or MAKE_DIRS?

[dieter roelants <dieter.NetBSD%pandora.be@localhost>]

Hi,

What are, if any, the guidelines for choosing between unexec ${DIRRM} in
the PLIST or MAKE_DIRS in the Makefile for directories shared between
some packages? Also, when should one use OWN_DIRS, and when MAKE_DIRS?
I.e. when should the package admin be prompted to remove the directory?

kind regards
dieter

PS. please keep me in CC.