Allow for OS and SUBOS folders so we can introduce NetBSD scripts whilst keeping BSD for all BSD's.

mk/subdir.mk

@@ -0,0 +1,39 @@
+# Recursive rules
+# Adapted from FreeBSDs bsd.subdir.mk
+# Copyright 2007-2008 Roy Marples <roy@marples.name>
+
+_+_ ?= +
+ECHODIR ?= echo 
+_SUBDIR = @${_+_}for x in ${SUBDIR}; do \
+	if test -d $$x; then \
+	${ECHODIR} "===> ${DIRPRFX}$$x (${@:realinstall=install})"; \
+		cd $$x; \
+		${MAKE} ${@:realinstall=install} \
+		DIRPRFX=${DIRPRFX}$$x/ || exit $$?; \
+		cd ..; \
+	fi; \
+	if test -d $$x.${OS}; then \
+	${ECHODIR} "===> ${DIRPRFX}$$x.${OS} (${@:realinstall=install})"; \
+		cd $$x.${OS}; \
+		${MAKE} ${@:realinstall=install} \
+		DIRPRFX=${DIRPRFX}$$x.${OS}/ || exit $$?; \
+		cd ..; \
+	fi; \
+	if test -d $$x.${SUBOS}; then \
+	${ECHODIR} "===> ${DIRPRFX}$$x.${SUBOS} (${@:realinstall=install})"; \
+		cd $$x.${SUBOS}; \
+		${MAKE} ${@:realinstall=install} \
+		DIRPRFX=${DIRPRFX}$$x.${SUBOS}/ || exit $$?; \
+		cd ..; \
+	fi; \
+done
+
+all:
+	${_SUBDIR}
+clean:
+	${_SUBDIR}
+realinstall:
+	${_SUBDIR}
+install: realinstall ${INSTALLAFTER}
+depend:
+	${_SUBDIR}