yum remove git

yum install zlib （系统默认已经装上）

yum install zlib-devel 

># wget https://github.com/git/git/archive/v2.2.1.tar.gz

># tar zxvf v2.2.1.tar.gz

># cd git-2.2.

># 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" >> /etc/bashrc

># source /etc/bashrc

># git --version

>git version 2.2.