安裝軟件時提示說需要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 

查詢當前版本：

1 # rpm -qf /usr/bin/autoconf  
2 autoconf-2.63-5.1.el6.noarch  

卸載當前版本：

1 # rpm -e --nodeps autoconf-2.63
 

安裝最新版本：

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  

查看當前版本：

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已升級到2.69

CentOS6.9升級autoconf版本，解決”Autoconf version 2.64 or higher is required“錯誤