. Replace some hardwired /usr/local instances with LOCALBASE.
. Small Makefile restructure to keep related variables in one place.
. Add ipv6 to CATEGORIES if its enabled. [2]
PR: 106130 [2]
Submitted by: Janos Mohacsi <janos.mohacsi@bsd.hu> [2]
Pointed out by: pointyhat (via kris) [1]