Installing Ruby can be difficult sometimes. With the number of different operating system distributions, number of versions, and possible local configurations, it is hard to make a one-stop install that fits every user's need.

The primary resource for installing Ruby remains the download page on the ruby-lang site itself.

If you can, you should first try to install Ruby using tools such as rvm?, rbenv?, ruby-build?, and so on.

These represent the minimal set of steps to install Ruby on a Linux system from the source. To install Ruby from on a Mac, use HomeBrew?. To install Ruby on Windows, please see RubyInstaller.

Install your favourite distribution

These instructions work for any Debian-based linux system, as well as some others.

The Debian system installer, apt?, is assumed here. Other linux distributions have different installers, and potentially other package names.

Log in as root

$ sudo -i
Password: # enter your user's password
$

Install Packages Ruby Needs to Build from Source

$ apt-get install <package> # see list below

Ruby needs these to build correctly.

  • build-essential
  • git-core
  • curl
  • bison
  • openssl
  • libreadline6
  • libreadline6-dev
  • zlib1g
  • zlib1g-dev
  • libssl-dev
  • libyaml-dev
  • libxml2-dev
  • libxslt-dev
  • autoconf
  • libc6-dev
  • ncurses-dev
  • libcurl4-openssl-dev
  • libopenssl-ruby
  • apache2-prefork-dev
  • libapr1-dev
  • libaprutil1-dev
  • libx11-dev
  • libffi-dev
  • tcl-dev
  • tk-dev

These will pull in other packages as needed.

  1. $ apt-get install build-essential git-core curl bison openssl \
  2. libreadline6  libreadline6-dev zlib1g zlib1g-dev libssl-dev \
  3. libyaml-dev libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev \
  4. libcurl4-openssl-dev libopenssl-ruby apache2-prefork-dev libapr1-dev \
  5. libaprutil1-dev libx11-dev libffi-dev tcl-dev tk-dev

Acquire the Ruby Source

Download the latest version of Ruby here: http://www.ruby-lang.org/en/downloads/ under the Compiling Ruby Source code section.

cd /usr/src
wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.0.tar.gz
tar zxvf ruby-2.1.0.tar.gz
cd ruby-2.1.0

Do the needful

This is the point where you will actually configure, build, and install ruby onto your system. Deciding where to put the new version is something you have to consider.

Installing into /usr directory will replace the existing system ruby. This isn't a bad idea in all cases, but some packages and utilities may rely on features in the old version of ruby. Still, I haven't encountered any problems in do this on a modern running debian-based system.

Installing into /usr/local is a popular option, but you need to ensure that you have your environment set up to know which ruby to run. When logged in, it is rather simple to keep the /usr/local directory before the /usr directory in your PATH environment variable, which is all that should really be necessary. However, in other environments, such as crontab and other system settings, you might need to do a little more to ensure the PATH is set correctly.

./configure --prefix=/usr # default setups
make # compiles the source
make install # installs the programs in /usr/bin, etc

Test the install

cd
which ruby; ruby --version
which irb; irb --version
which gem; gem --version
which rake; rake --version

Install some gems

gem install bundler
gem install rails

bundler is probably the most important gem to install. It is used to manage gems for developing programs, libraries, ruby packages, and applications. Install it, and be happy.

Rails is the premier web application framework based on Ruby and is the reason so many people learn Ruby. It's not the only one, so you don't have to install it, but it's really a good test of a new installation of ruby.

Logout from root, login as user

Of note, since you've compiled and installed ruby as the system ruby, you will need to continue installing gems as the superuser, unless you set the environment variable GEM_PATH in your user's .profile to something you can write to. This is the best way to do development, with your own local per-user set of gems. When you deploy your ruby projects, you'll be able to decide at that point where and how to install necessary gems.

Create a new gem

  1. $ mkdir -p ~/Projects/ruby_projects
  2. $ cd ~/Projects/ruby_projects
  3. $ bundle gem my_test_gem

Create a test rails app

  1. $ mkdir -p ~/Websites/rails
  2. $ cd ~/Websites/rails
  3. $ rails new my_test_rails

Summary: A step-by-step recording of building a Ruby dev system from source Parent:(Technology.)Ruby IncludeMe?:Ruby Categories:Articles, HowTos Tags: ruby, howtos


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