Gosu/Ruby fails to install

Question

Gosu fails to install on my Mountain Lion (10.8.3). Here's the error I get:

Building native extensions.  This could take a while...

ERROR:  Error installing gosu:
ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb
The Gosu gem requires some libraries to be installed system-wide.
See the following site for a list:
https://github.com/jlnr/gosu/wiki/Getting-Started-on-Linux

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:338:in `symlink': File exists - ../linux/gosu.bundle or ../lib/gosu.bundle (Errno::EEXIST)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:338:in `ln_s'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:1418:in `fu_each_src_dest0'
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb:336:in `ln_s'
from extconf.rb:99

What I tried so far:

• Checked that I've got Command line tools installed in My XCode. This guy had same problem. But we evidently have different source(s) of problem(s).
• Tried installing dependencies from the rubygame website, appearently helped this guy. Installed the libraries like this guy.
• Changed the path to put /usr/local/bin in front of /usr/bin/. That didn't help either.
• Tried to install Rubygame gem : And same problem!
• Tried to install SDL gem : Same problem!
• So I decided to try to install something different: the Cake gem. It worked!
• I decided to give up and ask the question in stackoverflow.
• I typed my problem in stackoverflow.

So what could the problem be?

Answer 1

I had a similar issue. After tinkering in my Path forever, I downloaded and ran Jewelrybox. Afterwards, I had it reinstall ruby-1.9.3 -p448, during which it ran diagnostics. Thankfully was able to install gosu after that.

Try that out, hopefully it works for you too.