centos中安装、升级git

yum install git若是从老版本升级，则按下面方法。（centos中）先更新系统
sudo yum update    安装依赖的包
yum install curl-devel expat-devel gettext-devel openssl-devel zlib-devel gcc perl-ExtUtils-MakeMaker下载git源码并解压缩
wget https://github.com/git/git/archive/v2.3.0.zip
unzip v2.3.0.zip
cd git-2.3.0make prefix=/usr/local/git all
make prefix=/usr/local/git install在这可能会类似下面的错误：
/root/git/git-2.3.0/utf8.c:463: undefined reference to `libiconv'
然后按后面的方法解决。安装成功后git --version，若不是新版本，则要把编译安装的git路径放到环境变量里查看git所在的路径：
whereis git
git: /usr/bin/git /usr/local/git /usr/share/man/man1/git.1.gz第二个即是git的路径
vi /etc/profile    在最后加：
export PATH=/usr/local/git/bin:$PATH重新加载
source /etc/profilegit --version
git version 2.3.0
大功告成。------------------
安装libiconv
cd && 
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创建一个软链接到/usr/lib
ln -s /usr/local/lib/libiconv.so /usr/lib
ln -s /usr/local/lib/libiconv.so.2 /usr/lib然后回到git目录继续编译
cd /usr/local/git
make configure
./configure --prefix=/usr/local --with-iconv=/usr/local/libiconv
make
make install