Problems installing gsl gem

Question

I can succesfully install the gsl library in my home directory, but when I try to install the gsl gem I get a big list of errors that I do not understand. I am wondering if

Answer 1

lsb_release -a Ubuntu 14.04.1 LTS
ruby --version ruby 2.1.2p95

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Important: Install gsl development package (https://askubuntu.com/a/490475/121418)
sudo apt-get install libgsl0-dev

Add this line in Gemfile
gem 'rb-gsl'

Install gem via Terminal
bundle install

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Verify
bundle show rb-gsl
/.rvm/gems/ruby-2.1.2/gems/rb-gsl-1.16.0.4

gsl-config --version
1.15

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Use require "gsl" in ruby file if necessary