Fails to build with Ruby 2.2.1

[Ghassan]

I downloaded the gem and when I run
sudo ruby setup.rb I get:

setup.rb:283: warning: duplicated key at line 284 ignored: "bin-dir"
setup.rb:788:in load_rbconfig': uninitialized constant Config (NameError) from setup.rb:768:ininvoke'
from setup.rb:1578:in `

'

Any clues or ides why is this happening? I installed gsl 1.15 on my OSX Yosemite. Help is warmly appreciated please?

[ktns]

setup.rb is very old, and probably not maintained anymore.
Use rubygems instead.
Rubygems is bundled with ruby 1.9 or later.

[agarie]

We probably should remove setup.rb.