diff --git a/shadowsocks-libev-debian.sh b/shadowsocks-libev-debian.sh
index b4ae018..2768655 100644
--- a/shadowsocks-libev-debian.sh
+++ b/shadowsocks-libev-debian.sh
@@ -94,7 +94,7 @@ pre_install(){
     # Update System
     apt-get -y update
     # Install necessary dependencies
-    apt-get -y --no-install-recommends install wget unzip curl build-essential autoconf libtool openssl libssl-dev zlib1g-dev xmlto asciidoc
+    apt-get -y --no-install-recommends install wget unzip curl build-essential autoconf libtool openssl libssl-dev zlib1g-dev xmlto asciidoc libpcre3 libpcre3-dev
     # Get IP address
     echo "Getting Public IP address, Please wait a moment..."
     echo -e "Your main public IP is\t\033[32m $(get_ip) \033[0m"
diff --git a/shadowsocks-libev.sh b/shadowsocks-libev.sh
index d7854c3..b22cdb6 100644
--- a/shadowsocks-libev.sh
+++ b/shadowsocks-libev.sh
@@ -117,8 +117,9 @@ pre_install(){
     echo "Press any key to start...or Press Ctrl+C to cancel"
     char=`get_char`
     #Install necessary dependencies
-    yum install -y wget unzip openssl-devel gcc swig python python-devel python-setuptools autoconf libtool libevent xmlto
-    yum install -y automake make curl curl-devel zlib-devel openssl-devel perl perl-devel cpio expat-devel gettext-devel asciidoc
+    yum install -y wget unzip openssl-devel gcc swig python python-devel python-setuptools
+    yum install -y autoconf libtool libevent xmlto asciidoc pcre pcre-devel make curl curl-devel
+    yum install -y automake zlib-devel openssl-devel perl perl-devel cpio expat-devel gettext-devel
     # Get IP address
     echo "Getting Public IP address, Please wait a moment..."
     echo -e "Your main public IP is\t\033[32m $(get_ip) \033[0m"