build fix

externals/xbyak/Makefile

@@ -0,0 +1,24 @@
+PREFIX?=/usr/local
+INSTALL_DIR=$(PREFIX)/include/xbyak
+
+all:
+	$(MAKE) -C sample
+
+clean:
+	$(MAKE) -C sample clean
+
+install:
+	mkdir -p $(INSTALL_DIR)
+	cp -pR xbyak/*.h $(INSTALL_DIR)
+
+uninstall:
+	rm -i $(INSTALL_DIR)/*.h
+	rmdir $(INSTALL_DIR)
+
+update:
+	$(MAKE) -C gen
+
+test:
+	$(MAKE) -C test test
+
+.PHONY: test update