Mountain Lion + rbenv + mysql2

.bash_profile

export PATH="$HOME/.rbenv/bin:$PATH:/usr/local/mysql/bin"
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib
eval "$(rbenv init -)"

README.md

Overview

Steps to get MySQL2 up and running on Mountain Lion:

The basics

1. Install Homebrew
2. Install rbenv + ruby-build
3. Install 1.9.3-p286 using rbenv install 1.9.3-p286
4. Install mysql from here.

The error

Running gem install mysql2 results in the following error:

Library not loaded: libmysqlclient.18.dylib

The fix

Edit your ~/.bash_profile so that it looks like:

export PATH="$HOME/.rbenv/bin:$PATH:/usr/local/mysql/bin"
export DYLD_LIBRARY_PATH=/usr/local/mysql/lib
eval "$(rbenv init -)"

External resources

The following links helped me figure this out:

StackOverflow