# yum remove ruby
# yum -y install gcc zlib-devel openssl-devel sqlite sqlite-devel

# export http_proxy=http://192.168.0.10:9999/
# wget ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p353.tar.gz 

# tar zxvf ruby-2.0.0-p353.tar.gz
# cd ruby-2.0.0-p353

# ./configure
# make
# make install

# ruby -v
# ln -s /usr/local/bin/ruby /usr/bin/ruby   <- If you needed

# tar xzf ruby-2.0.0-p647.tar.gz
# cd ruby-2.0.0-p647
# ./configure --prefix=/usr/local/ruby2.0.0-p647
# make
# make install

# ls -lh /usr/local/bin | grep ruby
# ln -s /usr/local/ruby2.0.0-p647/bin/* /usr/local/bin/
# ls -lh /usr/local/bin | grep ruby

# cat ruby-2.0.0-p353/.installed.list