http://www.rsyslog.com/downloads/download-other/

http://www.rsyslog.com/download/stable-download/page/files/download/rsyslog/rsyslog-5.8.13.tar.gz

[root@localhost sbin]# yum list |grep zlib

zlib.i386                                  1.2.-.el5                 installed

zlib.x86_64                                1.2.-.el5                 installed

zlib-devel.x86_64                          1.2.-.el5                 installed

jzlib.x86_64                               1.0.-4jpp.                base

jzlib-demo.x86_64                          1.0.-4jpp.                base

jzlib-javadoc.x86_64                       1.0.-4jpp.                base

zlib-devel.i386                            1.2.-.el5                 base

You have new mail in /var/spool/mail/root

yum install zlib-devel.x86_64  

./configure
make
make all

ln -s /usr/local/sbin/rsyslogd rsyslogd      (由3.22---->5.8.13)