下载git2.x版本：
https://github.com/git/git/tree/v2.13.1 找个稳定版本，找个最新Tag就行了
https://www.kernel.org/pub/software/scm/git/ 从这下载
安装：
环境: CentOS 7.x，git采用最常用的./configure && make && makesintall 方式安装。但在安装过程中可能会报错，需要安装一些依赖，具体步骤如下：
//卸载
# yum remove git
# cd /usr/local/
//1、下载
# wget https://www.kernel.org/pub/software/scm/git/git-2.13.1.tar.gz
# cd git-2.13.1
//2、执行./configure，会报错
# ./configure
configure: Setting lib to 'lib' (the default)
configure: Will try -pthread then -lpthread to enable POSIX Threads.
configure: CHECKS for site configuration
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/usr/local/git-2.13.1':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
//安装gcc依赖，之后再执行./configure 就不会报错了
# yum -y install gcc
//3、编译，报错:缺少zlib的头文件，开发包没装，
//yum install zlib （系统默认已经装上）
//yum install zlib-devel
# make
GIT_VERSION = 2.13.1
* new build flags
CC credential-store.o
In file included from credential-store.c:1:0:
cache.h:40:18: fatal error: zlib.h: No such file or directory
#include <zlib.h>
^
compilation terminated.
make: *** [credential-store.o] Error 1
//安装zlib-devel
# yum -y install zlib-devel
//4、编译，报错：缺少perl
# make
...
BEGIN failed--compilation aborted at Makefile.PL line 3.
make[1]: *** [perl.mak] Error 2
make: *** [perl/perl.mak] Error 2
# yum install perl-ExtUtils-MakeMaker package
//5、安装支持https
# yum install libcurl-devel
//6、make && make install
# make
# make install
注：git clone时候提示fatal: Unable to find remote helper for 'https'
yum install libcurl-devel
然后按照上诉步骤重新安装编译git即可。
检查
# vim /etc/bashrc
export PATH=$PATH:/usr/local/bin/git
# source /etc/bashrc
# git --version
git version 2.13.1
常见问题：
参考：
