安装编译环境
yum groupinstall "Development tools"
或者
yum install gcc gcc-c++ gcc-g77 flex bison autoconf automake bzip2-devel zlib-devel ncurses-devel libjpeg-devel libpng-devel libtiff-devel freetype-devel pam-devel openssl-devel libxml2-devel gettext-devel pcre-devel
删除已经安装的项目：
yum erase ruby ruby-libs ruby-mode ruby-rdoc ruby-irb ruby-ri ruby-docs
安装依赖：
yum -y install zlib-devel curl-devel openssl-devel httpd-devel apr-devel apr-util-devel mysql-devel
下载Ruby源码并解压缩：
wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gztar zxvf ruby-2.1.5.tar.gz
编译安装：
cd ruby-2.1.5
./configure
make
make install
检查安装：
ruby -v
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