DIRS = lib sockets advio call calld daemons datafiles db environ exercises \	file ipc ipp lock mycat open opend opend.fe open.fe proc pty \	sess signals std stdio streams termios threadctl threadsall:	$(MAKE) `./systype.sh`clean:	for i in $(DIRS); do \		(cd $$i && $(MAKE) -f `../systype.sh`.mk clean) || exit 1; \	donefreebsd:	for i in $(DIRS); do \		(cd $$i && $(MAKE) -f freebsd.mk) || exit 1; \	donelinux:	for i in $(DIRS); do \		(cd $$i && $(MAKE) -f linux.mk) || exit 1; \	donemacos:	for i in $(DIRS); do \		(cd $$i && $(MAKE) -f macos.mk) || exit 1; \	donesolaris:	for i in $(DIRS); do \		(cd $$i && $(MAKE) -f solaris.mk) || exit 1; \	done