Post RVM install issues on Mac OS Mountain Lion

Tonight I installed RVM on my MacBook Pro in order to use multiple versions of Ruby side by side. I ran into a number of issues:

Issue 1: Failed to build gem native extension

After installing RVM and ruby 1.9.4 I needed to install some gems but running the gem installer resulted in the following error:

ERROR:  Error installing mechanize:
ERROR: Failed to build gem native extension

The solution:

Download and install the gcc installer for Mac OS from here:

The source:

This tip came courtesy of Alex Zak on stackoverflow. It looks like gcc used to come bundled in XCode’s command line tools but no longer does.


Issue 2: Gems I installed were not visible

This time the gem install worked and I didn’t receive the above error message. However, when I attempted to run my application the require statement failed and executing gem list did not show my gems.

The solution:

Running the following command fixed my issues:

rvm use ruby-1.9.3-p125 --default


The source:

The resolution came from pcragone on stackoverflow


Issue 3: OpenSSL certificate verify failed

Running an application that previously worked I received the following error:

OpenSSL certificate verify failed

The solution:

I’ve seen this on Windows before but never on my Mac. Because I’m using RVM, the solution was pretty straightforward, using the following commands to fix the issue:

$ rvm remove 1.9.3 (or whatever version of ruby you are using)
$ rvm pkg install openssl
$ rvm install 1.9.3 --with-openssl-dir=$rvm_path/usr

The source:

The railsapp blog on github has a nice writeup on this


The End

I hope this helps someone as the original sources helped me tonight!

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