diff --git a/shadowsocks.sh b/shadowsocks.sh
index a701ae4..bbd0bbe 100644
--- a/shadowsocks.sh
+++ b/shadowsocks.sh
@@ -157,11 +157,6 @@ check_sys() {
     fi
 }
 
-# autoconf_version
-version_ge() {
-    test "$(echo "$@" | tr " " "\n" | sort -rV | head -n 1)" == "$1"
-}
-
 # centosversion
 getversion() {
     if [[ -s /etc/redhat-release ]]; then
@@ -208,24 +203,6 @@ debianversion() {
     fi
 }
 
-autoconf_version() {
-    if [ ! "$(command -v autoconf)" ]; then
-        echo -e "[${green}Info${plain}] Starting install package autoconf"
-        if check_sys packageManager yum; then
-            yum install -y autoconf >/dev/null 2>&1 || echo -e "[${red}Error:${plain}] Failed to install autoconf"
-        elif check_sys packageManager apt; then
-            apt -y update >/dev/null 2>&1
-            apt -y install autoconf >/dev/null 2>&1 || echo -e "[${red}Error:${plain}] Failed to install autoconf"
-        fi
-    fi
-    local autoconf_ver=$(autoconf --version | grep autoconf | grep -oE "[0-9.]+")
-    if version_ge ${autoconf_ver} 2.67; then
-        return 0
-    else
-        return 1
-    fi
-}
-
 get_ip() {
     local IP=$(ip addr | egrep -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | egrep -v "^192\.168|^172\.1[6-9]\.|^172\.2[0-9]\.|^172\.3[0-2]\.|^10\.|^127\.|^255\.|^0\." | head -n 1)
     [ -z ${IP} ] && IP=$(wget -qO- -t1 -T2 ipv4.icanhazip.com)