安装软件时提示说需要Autoconf 2.64或更高的版本：
[root@wslu-cs wslu]# autoconf
configure.ac:8: error: Autoconf version 2.64 or higher is required
configure.ac:8: the top level
autom4te: /usr/bin/m4 failed with exit status: 63
查询当前版本：
[root@wslu-cs wslu]# rpm -qf /usr/bin/autoconf
autoconf-2.63-5.1.el6.noarch
卸载当前版本：
[root@wslu-cs wslu]# rpm -e --nodeps autoconf-2.63
安装最新版本：
[root@wslu-cs wslu]# wget ftp://ftp.gnu.org/gnu/autoconf/autoconf-2.68.tar.gz
[root@wslu-cs wslu]# tar zxvf autoconf-2.68.tar.gz
[root@wslu-cs wslu]# cd autoconf-2.68
[root@wslu-cs wslu]# ./configure --prefix=/usr/
[root@wslu-cs wslu]# make && make install
查看当前版本：
[root@wslu-cs autoconf-2.68]# /usr/bin/autoconf -V
autoconf (GNU Autoconf) 2.68
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+/Autoconf: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by David J. MacKenzie and Akim Demaille.
至此，autoconf已升级到2.68。