K 10
svn:author
V 6
brooks
K 8
svn:date
V 27
2013-01-15T00:12:34.154944Z
K 7
svn:log
V 424
Add an option DB_FROM_SRC to use src/etc's user/group databases when
installing.  This allows things like running installworld for 10-CURRENT
on a 9.0-RELEASE system without adding extra users and groups to the
passwd and group files.

To prevent potentially risky uid/gid mismatches on systems with
non-standard local values, require that DESTDIR be set if DB_FROM_SRC is
set.

Sponsored by:	DARPA, AFRL
Reviewed by:	peter

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