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How to install Ruby 1.9.3 on Mac OS X with LLVM and rbenv

February 25, 2012 at 5:17 pm

Since Xcode 4.2 Apple doesn’t ship a normal GCC anymore, but instead packages LLVM. While it was possible to compile Ruby with LLVM before, the result was error prone. Not anymore! Since 1.9.3-p125 Ruby is fully compatible with LLVM and here is how you can install it without the need of any additional GCC installation.

I’m going to use rbenv and ruby-build in the progress. This way everything is installed in ~/.rbenv and you won’t need any administrator privileges.

  1. Install Xcode 4.3 or the new stand-alone command line tools
  2. Install rbenv and ruby-build 
    # install rbenv
$ git clone git://github.com/sstephenson/rbenv.git ~/.rbenv
$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> .bash_profile
$ echo 'eval "$(rbenv init -)"' >> .bash_profile
# You may be using Zsh or any other shell.
# I presume you know how to adopt the previous two lines then.

# install ruby-build
$ mkdir -p ~/.rbenv/plugins
$ git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build

# reload bash (alternatively close and re-open Terminal)
$ source ~/.bash_profile
  3. Compile Ruby 1.9.3-p125 and make default ruby 
    $ env CC=/usr/bin/gcc rbenv install 1.9.3-p125
$ rbenv global 1.9.3-p125
$ rbenv rehash
  4. Done. Check everything is ok now 
    $ ruby -v
# => ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin11.3.0]

Sweet. Leave a note in the comments if this helped you. Happy coding!

Server, Web 2.0 | 1 comment | Tags:

uninitialized constant MysqlCompat::MysqlRes

August 5, 2010 at 5:12 pm

When running rake tasks (that are related to the database) in Rails apps I ran into the following error a couple of times on different OS X Snow Leopard machines:

uninitialized constant MysqlCompat::MysqlRes

The mysql gem is installed but got compiled for a wrong architecture for some reason. I’m not 100% sure when this happens but if you run into the problem uninstall the mysql gem

$ sudo gem uninstall mysql

and reinstall it with this flag

$ sudo env ARCHFLAGS="-arch x86_64" gem install mysql

if you are using rvm you can skip the “sudo” on all commands.

Cognitions, Web 2.0 | 1 comment | Tags: , ,