Installation Prerequisites

Hydra Installation Prerequisites

ruby
- ruby 1.9.3 is required by hydra-head gem release 4.0
- ruby 1.8.7 is used by release 3.3 and below. RVM (see below) expects ree 1.8.7 (Ruby Enterprise Edition)
git
java NOTE: version 1.6 or higher
sqlite3
RVM (Ruby Version Manager)
- We strongly suggest using RVM as a means of keeping your different ruby applications with their specific gem requirements from having version clashes. The instructions assume the use of RVM.
- If you don’t have the desired ruby version in RVM, e.g. ruby 1.9.3 or ree 1.8.7, then install it.
  rvm install ruby-1.9.3
- NOTE: OS X 10.7 users; XCode no longer has a real gcc, and ruby 1.8.7 needs the real deal. If you are using homebrew, you can get gcc with this command
  brew install https://raw.github.com/Homebrew/homebrew-dupes/master/apple-gcc42.rb
rubygems
these ruby gems:
- rails
  - rails version 3.0.x (not 3.1) for hydra-head gem releases 3.0 – 4.0
  - rails 2.3.11 is used by hydra-head release 2.x
    - bundler must be explicitly installed for rails 2.