add a .mk

Makefile

@@ -2,17 +2,19 @@ SHELL = /bin/sh
 NAME = iron
 VER = 1.2
 
+include options.mk
+
 help:
 	@echo "make install     Install ${NAME}."
 	@echo "make uninstall   Uninstall ${NAME}."
 
 install:
-	cp ${NAME} ${DESTDIR}${PREFIX}/bin
-	chmod +x ${DESTDIR}${PREFIX}/bin/${NAME}
+	cp ${NAME} ${PREFIX}${DESTDIR}/bin
+	chmod +x ${PREFIX}${DESTDIR}/bin/${NAME}
 
 uninstall:
 	rm -rf ~/.config/${NAME}
-	rm -f ${DESTDIR}${PREFIX}/bin/${NAME}
+	rm -f ${PREFIX}${DESTDIR}/bin/${NAME}
 
 dist:
 	mkdir -p ${NAME}-${VER}

options.mk

@@ -0,0 +1,2 @@
+VER = 1.2
+DESTDIR = "/usr"