A better tree thinking in ports

Signed-off-by: Álvaro Jurado <elbingmiss@gmail.com>

Author: Álvaro Jurado

lib/Makefile

@@ -0,0 +1,27 @@
+include $(OS).inc
+
+all: lib cmd
+
+dirs:
+	mkdir -p $(APEXLIB)
+	mkdir -p $(APEXBIN)
+
+cmd: dirs
+	$(MAKE) -C cmd
+	$(MAKE) -C cmd install
+	$(MAKE) -C cmd clean
+
+lib: dirs
+	@cd ap && $(MAKE)
+	@echo "Done!"
+
+# we clone into /tmp/harvey instead of . to make sure a HARVEY path that
+# is out of tree will work.
+travis:
+	git clone https://github.com/Harvey-OS/harvey /tmp/harvey
+	(cd /tmp/harvey && bash ./bootstrap.sh && ./util/build sys/src/libc/libc.json)
+	mkdir -p $(APEXLIB)
+	@cd ap &&$(MAKE)
+	@cd cmd && $(MAKE)
+	@cd cmd && $(MAKE) install
+	@echo "Done!"