Before you say yum -y install ruby193... I did that.
Please note that I am not a Ruby developer, but need this program as part of another developer's work via web services. (He is not available.) Any help would be greatly appreciated.
I attempted to install a library per instructions and got:
[root@ctbroker console]# gem install json -v '1.8.0'
Building native extensions. This could take a while...
ERROR: Error installing json:
ERROR: Failed to build gem native extension. /opt/rh/ruby193/root/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /opt/rh/ruby193/root/usr/share/include/ruby.h
Gem files will remain installed in /opt/rh/ruby193/root/usr/local/share/gems/gems/json-1.8.0 for inspection.
Results logged to /opt/rh/ruby193/root/usr/local/share/gems/gems/json-1.8.0/ext/json/ext/generator/gem_make.out
I noticed that ruby.h is only on the machine at /usr/lib64/ruby/1.8/x86_64-linux/ruby.h.
What am I missing?
I was able to to fix this problem on my system by running:
sudo yum install ruby193-ruby-devel.x86_64
RHELyum install scl-utils scl-utils-build
CENTOSyum install centos-release-SCL -y
yum install ruby193 ruby193-ruby-devel augeas-devel libxml2-devel -y
scl enable ruby193 "ruby -v"
scl enable ruby193 "bash"
gem install json -v '1.8.0'
Step 1: Run below command on your terminal:
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3
Step 2: Install RVM Development version on your system:
\curl -sSL https://get.rvm.io | bash
For Latest version of Ruby i.e. 2.2.1 follow below steps:
\curl -sSL https://get.rvm.io | bash -s stable --ruby
After this step you should see a message like:
To start using RVM you need to run source /home/user_name/.rvm/scripts/rvm in all your open shell windows, in rare cases you need to reopen all shell windows.
Step 3: Activate ruby using the message
Source /home/user_name/.rvm/scripts/rvm
Step 4: Check Ruby version
ruby --version
Step 5: Say thanks if it works ;)
You may need to install following packages first:
yum install ruby-devel.x86_64 libxslt-devel libxml2-devel
来源：https://stackoverflow.com/questions/18918588/did-i-install-ruby-1-9-3-correctly-on-rhel