`make install` now install the manpage

Makefile

@@ -19,8 +19,10 @@ clean:
 install: all
 	install -d ${DESTDIR}${PREFIX}/bin/
 	install -m 755 ${PROG} ${DESTDIR}${PREFIX}/bin/
+	install -m 644 ${PROG}.1 ${DESTDIR}${MANPREFIX}
 
 uninstall:
-	rm -f ${DESTDIR}${PREFIX}/bin/${PROG}
+	rm -f ${DESTDIR}/${PREFIX}/bin/${PROG}
+	rm -f ${DESTDIR}/${MANPREFIX}/${PROG}.1
 
 .PHONY: all clean install uninstall