diff --git a/Makefile b/Makefile
index 7951e4d..04cb18b 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,6 @@
+#makefile for build package 
 
-#!/bin/sh
-
-build_root=$(pwd)
+build_root=$(shell pwd)
 project=ems
 # os platform
 platform=ub22