+# Redhat+CentOS : stunnel does not work! you need to install stunnel-4
+#
+# Debian+Ubuntu : stunnel-5 does not work! you need to install stunnel-4
+#
+# apt-get install gcc make libssl-dev
+# yum install gcc make openssl-devel
+# cd /tmp
+# wget ftp://ftp.nluug.nl/pub/networking/stunnel/archive/4.x/stunnel-4.57.tar.gz
+# tar xvzf stunnel-4.57.tar.gz
+# cd stunnel-4.57
+# ./configure --prefix /opt/stunnel-4.57
+# make
+# make install
+# ln -s /opt/stunnel-4.57/bin/stunnel /usr/local/bin/stunnel4