rbenv
rbenv (Simple Ruby Version Management) lets you easily switch between multiple versions of Ruby. It is simple, unobtrusive, and follows the UNIX tradition of single-purpose tools that do one thing well.
Another tool to be used for the same purpose is RVM.
Installation
Plugins
rbenv can be extended via a plugin system, and the rbenv wiki includes a list of useful plugins. The ruby-build plugin is especially useful, as it allows you to install Ruby versions with the rbenv install command. You can install ruby-buildAUR from the AUR.
Troubleshooting
Ruby 2.3.x
Before compiling, make sure you have all the dependencies needed:
pacman -S --needed base-devel libffi libyaml openssl zlib
Installation of Ruby 2.3.x may break down due to openssl version described here:
ossl_ssl.c:465:38: error: ‘CRYPTO_LOCK_SSL_SESSION’ undeclared
Here is a way how you can make a ruby compile:
1. Install the openssl-1.0 package first.
2. Then run:
PKG_CONFIG_PATH=/usr/lib/openssl-1.0/pkgconfig \ rbenv install 2.3.4
Ruby 2.x.x
Installation of Ruby 2.0.0, 2.1.4, 2.1.6, 2.1.7, 2.2.2 and 2.2.3 may show this error
ossl_ssl.c:141:27: error: ‘SSLv3_method’ undeclared here (not in a function)
This can be solved using the patch as described here
curl -fsSL https://gist.github.com/mislav/055441129184a1512bb5.txt | PKG_CONFIG_PATH=/usr/lib/openssl-1.0/pkgconfig rbenv install --patch 2.2.3
Ruby 1.9.3
Installation of Ruby 1.9.3 may show the same error:
ossl_ssl.c:116:27: error: ‘SSLv3_method’ undeclared here (not in a function)
This can be solved by using the patch as described here
curl -fsSL https://gist.githubusercontent.com/anonymous/679228bc324d6fdd3074.txt | rbenv install --patch 1.9.3-p448
If above was not enough you can install openssl-1.0 and gcc6 and try:
curl -fsSL https://gist.githubusercontent.com/anonymous/679228bc324d6fdd3074.txt | CC=/usr/bin/gcc-6 PKG_CONFIG_PATH=/usr/lib/openssl-1.0/pkgconfig rbenv install --patch 1.9.3-p551