Ruby
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Installation on Ubuntu
- https://www.ruby-lang.org/en/documentation/installation/
- apt-get install ruby will install v1.8 or v1.9.
- I tried to install from the source (v2.2.1) on Ubuntu 14.04. The canonical method ./configure, make & sudo make install does not work at 'make' step. # See https://github.com/sstephenson/ruby-build/issues/690. Unfortunately the method of installing libffi-dev does not solve the error on Ubuntu 14.0.
- The next method is ruby-build. Don't quite follow it.
- http://stackoverflow.com/questions/26595620/how-to-install-ruby-2-1-4-on-ubuntu-14-04