因为go-get下载hugo失败，需要升级git到最新版本。

下载最新git代码

wget -O git-master.zip https://github.com/git/git/archive/master.zip

编译

unzip git-master.zip
cd git-master

yum install openssl-devel curl-devel expat-devel perl-ExtUtils-MakeMaker gettext gettext-libs gettext-devel asciidoc xmlto docbook2X

ln -s /usr/bin/db2x_docbook2texi /usr/bin/docbook2x-texi

错误

libgit.a(utf8.o): In function `reencode_string_iconv':
/usr/local/git/utf8.c:463: undefined reference to `libiconv'
libgit.a(utf8.o): In function `reencode_string_len':
/usr/local/git/utf8.c:502: undefined reference to `libiconv_open'
/usr/local/git/utf8.c:521: undefined reference to `libiconv_close'
/usr/local/git/utf8.c:515: undefined reference to `libiconv_open'
collect2: ld returned 1 exit status
make: *** [git-credential-store] Error 1

从错误提示看，是缺少libiconv。

安装libiconv

1. 下载编译

   cd /usr/local
   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. 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

3. 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

4. 此时，git应该编译安装成功了，测试如下：

   $ git --version
   git version 2.5.0