Wei's blog

echo insecure >> ~/.curlrc
curl -L get.rvm.io | bash -s stable
source /usr/local/rvm/scripts/'rvm'
yum --disableexcludes=all install m4 make gcc -y
cd /tmp
wget http://ftp.gnu.org/gnu/autoconf/autoconf-2.63.tar.gz
tar -xvvzf autoconf-2.63.tar.gz
cd autoconf-2.63
./configure
make -j4
make install
ln -s /usr/local/bin/autoconf /usr/bin/autoconf
autoconf --version
rm -rf autoconf-2.6.3

rvm pkg install zlib
rvm pkg install openssl
rvm install 1.9.2

/usr/local/rvm/rubies/ruby-1.9.2-p320/bin/gem install chef

mkdir -p /etc/chef/



reference:
http://blog.nexcess.net/2011/08/28/installing-rvm-on-centos-5/