Error installing mysql2: Failed to build gem native extension

Question

I am having some problems when trying to install mysql2 gem for Rails. When I try to install it by running bundle install or gem install mysq

Answer 1

Got the "You have to install development tools first." error when trying to install the mysql2 gem after upgrading to Mac OS X Mountain Lion. Apparently doing this upgrade removes the command line compilers.

To fix:

• I uninstalled my very old version of Xcode (ran the uninstall script in /Developer/Library). Then deleted the /Developer directory.
• Went to the AppStore and downloaded Xcode.
• Launched Xcode and went into the Preferences -> Downloads, and installed the command line tools.