Obtained from: NetBSD

"obj" directory stuff work

share/mk/bsd.obj.mk

@@ -0,0 +1,38 @@
+#	$Id: bsd.obj.mk,v 1.1 1996/03/24 16:37:36 wosch Exp wosch $
+
+# _SUBDIRUSE:
+# BSDSRCDIR?=/usr/src
+# BSDOBJDIR?=/usr/obj
+
+.if defined(MAKEOBJDIR) && !empty(MAKEOBJDIR)
+__objdir = ${MAKEOBJDIR}
+.else
+
+.if defined(MACHINE) && !empty(MACHINE)
+__objdir = obj.${MACHINE}
+.else
+__objdir = obj
+.endif
+.endif
+
+
+.if !target(obj)
+.if defined(NOOBJ)
+obj:
+.else
+
+obj:	_SUBDIRUSE cleanobj
+	@cd ${.CURDIR}; here=${.CURDIR}; 		\
+	dest=${BSDOBJDIR}`echo $$here | sed "s,^${BSDSRCDIR},,"`/${__objdir}; \
+	if test -d ${BSDOBJDIR}; then 			\
+		${ECHO} "$$here/${__objdir} -> $$dest"; \
+		ln -s $$dest ${__objdir}; 		\
+		if test ! -d $$dest; then 		\
+			mkdir -p $$dest; 		\
+		fi; 					\
+	fi
+.endif
+.endif
+
+cleanobj:
+	rm -f -r ${.CURDIR}/${__objdir}