Ruby 2.1 : Install2015/04/06

	The version of Ruby in CentOS 6 repository is 1.8 but Install 2.1 with RPM package if you need.
[1]	Install development packages first.

[root@dlp ~]#

yum -y groupinstall "Development Tools"

# install from EPEL

[root@dlp ~]#

yum --enablerepo=epel -y install libyaml libyaml-devel readline-devel ncurses-devel gdbm-devel tcl-devel openssl-devel db4-devel libffi-devel

[2]	Build RPM and Install Ruby 2.1. The verion of it in this example is latest Ruby 2.1.5 at April 2015 now.

[root@dlp ~]#

mkdir -p rpmbuild/{BUILD,BUILDROOT,RPMS,SOURCES,SPECS,SRPMS}

# get source

[root@dlp ~]#

wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.5.tar.gz -P rpmbuild/SOURCES

# get SPEC file

[root@dlp ~]#

wget https://raw.githubusercontent.com/feedforce/ruby-rpm/master/ruby21x.spec -P rpmbuild/SPECS

[root@dlp ~]#

rpmbuild -bb rpmbuild/SPECS/ruby21x.spec

[root@dlp ~]#

rpm -Uvh rpmbuild/RPMS/x86_64/ruby-2.1.5-2.el6.x86_64.rpm

Preparing...                ################################### [100%]
   1:ruby                   ################################### [100%]

[root@dlp ~]#

ruby -v

ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-linux-gnu]

[root@dlp ~]#

gem -v

2.2.2

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