#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：
tar zxvf ruby-1.9.3.pXXX.tar.gz
#编译安装：
cd ruby-1.9.3.pXXX
./configure
make && make install
#检查安装：
ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]
原文：http://my.oschina.net/duolus/blog/348353