github/gollum — Issue #215: Can't install Gem on OSX 10.7
Author: RobertWHurst
Created: 2011-10-21 00:08:27+00:00
State: open

Here's the terminal output

Roberts-Mac-Pro:~ roberthurst$ sudo gem install gollum
Building native extensions. This could take a while...
ERROR: Error installing gollum:
ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
mkmf.rb can't find header files for ruby at /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h

It seems to be an issue with Xcode version 4, but I don't know how to resolve this issue.