# yum install oPEnssl* openssl-devel zlib-devel gcc gcc-c++ make autoconf readline-devel curl-devel expat-devel gettext-devel

# service iptables stop
# setenforce 0
# vi /etc/Sysconfig/selinux
---------------
SELINUX=disabled
---------------

# wget http://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p247.tar.gz
# tar zxvf ruby-2.0.0-p247.tar.gz
# cd ruby-2.0.0-p247
# ./configure --enable-shared --enable-pthread --PRefix=/usr/local/ruby
# make && make install

ossl_pkey_ec.c:815: error: ‘EC_GROUP_new_curve_Gf2m' undeclared (First use in this function)

# cd ruby-2.0.0-p247
# wget --no-check-certificate https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/41808/raw/ext/openssl/ossl_pkey_ec.c
# wget --no-check-certificate https://bugs.ruby-lang.org/projects/ruby-trunk/repository/revisions/41808/raw/test/openssl/test_pkey_ec.rb
# mv ext/openssl/ossl_pkey_ec.c  ext/openssl/ossl_pkey_ec.c.bak
# cp ossl_pkey_ec.c ext/openssl/
# mv test/openssl/test_pkey_ec.rb test/openssl/test_pkey_ec.rb.bak
# cp test_pkey_ec.rb  test/openssl/

# make && make install

# echo "PATH=$PATH:/usr/local/ruby/bin;export PATH" >> /etc/profile
# source /etc/profile

# ruby -v
——————————————————————————
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]
——————————————————————————
# gem --version
——————————————————————————
2.0.3
——————————————————————————
# irb
——————————————————————————
irb(main):001:0> 3+5
=> 8
irb(main):002:0> puts "hello world!"
hello world!