安装软件时提示说需要Autoconf 2.64或更高的版本：
1 # autoconf 2 configure.ac:8: error: Autoconf version 2.64 or higher is required 3 configure.ac:8: the top level 4 autom4te: /usr/bin/m4 failed with exit status: 63
查询当前版本：
1 # rpm -qf /usr/bin/autoconf 2 autoconf-2.63-5.1.el6.noarch
卸载当前版本：
1 # rpm -e --nodeps autoconf-2.63
安装最新版本：
1 # wget https://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz 2 # tar zxvf autoconf-2.69.tar.gz 3 # cd autoconf-2.69 4 # ./configure 5 # make && make install
查看当前版本：
1 # /usr/bin/autoconf -V 2 autoconf (GNU Autoconf) 2.69 3 Copyright (C) 2010 Free Software Foundation, Inc. 4 License GPLv3+/Autoconf: GNU GPL version 3 or later 5 <http://gnu.org/licenses/gpl.html>, <http://gnu.org/licenses/exceptions.html> 6 This is free software: you are free to change and redistribute it. 7 There is NO WARRANTY, to the extent permitted by law. 8 9 Written by David J. MacKenzie and Akim Demaille.
至此，autoconf已升级到2.69
