Add a variable LOCAL_PREFIX that defaults to "/usr/local", as a

counterpart to X11BASE (default "/usr/X11R6").

Now PREFIX is set to ${X11BASE} or ${LOCAL_PREFIX} depending on
whether USE_IMAKE or USE_X11 is set or not.

This enables us to refer to non-X ports from X ports using
${LOCAL_PREFIX}, thus removing most of the remaining "/usr/local"s
from the ports tree.

This will also allow the system administrator to move the whole
"local" tree to somewhere else, without affecting X ports.  (Of course
not all ports are necessarily happy with that, but we're working on
it.)

Based on: an idea that came up while I was watching a football game
          several months ago ("hey, maybe I can move that sideline
          without disturbing the other!")

share/mk/bsd.port.mk

@@ -3,7 +3,7 @@
 #	bsd.port.mk - 940820 Jordan K. Hubbard.
 #	This file is in the public domain.
 #
-# $Id: bsd.port.mk,v 1.195 1996/03/06 08:14:26 asami Exp $
+# $Id: bsd.port.mk,v 1.196 1996/03/10 08:26:21 asami Exp $
 #
 # Please view me with 4 column tabs!
 
@@ -194,6 +194,7 @@
 # tree we are and thus can't go relative.  They can, of course, be overridden
 # by individual Makefiles.
 PORTSDIR?=		${DESTDIR}/usr/ports
+LOCAL_PREFIX?=	/usr/local
 X11BASE?=		/usr/X11R6
 DISTDIR?=		${PORTSDIR}/distfiles/${DIST_SUBDIR}
 PACKAGES?=		${PORTSDIR}/packages
@@ -214,7 +215,7 @@ PKGDIR?=		${.CURDIR}/pkg
 .if defined(USE_IMAKE) || defined(USE_X11)
 PREFIX?=		${X11BASE}
 .else
-PREFIX?=		/usr/local
+PREFIX?=		${LOCAL_PREFIX}
 .endif
 # The following 4 lines should go away as soon as the ports are all updated
 .if defined(EXEC_DEPENDS)