Git版本升级（查看版本信息 git version）
旧版本：git version 1.7.1
新版本：git version 2.2.1
一、安装依赖包：
1、下载安装 libiconv-1.14.tar.gz
wget http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.14.tar.gz
tar zxvf libiconv-1.14.tar.gz
cd libiconv-1.14
./configure --prefix=/usr/local/libiconv
make && make install
2、yum安装依赖包
yum -y install curl-devel expat-devel gettext-devel openssl-devel zlib-devel asciidoc gcc perl-ExtUtils-MakeMaker tcl xmlto
注：asciidoc如果无法通过yum安装，请下载包，编译安装
wget --no-check-certificate https://jaist.dl.sourceforge.net/project/asciidoc/asciidoc/8.6.9/asciidoc-8.6.9.zip
unzip asciidoc-8.6.9.zip
cd asciidoc-8.6.9
./configure
nake && make install
二、安装 新版git包
wget https://github.com/git/git/archive/v2.2.1.tar.gz
tar zxvf v2.2.1.tar.gz
cd git-2.2.1
make configure
./configure --prefix=/usr/local/git --with-iconv=/usr/local/libiconv
make all doc
make install install-doc install-html
echo "export PATH=$PATH:/usr/local/git/bin:/usr/local/git/libexec/git-core" >> /etc/bashrc
三、查看新版本
git version
