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

On my fresh install of Mac OS X Yosemite, I needed specifically 1.15.3, and homebrew can't get that for me (there is no brew install gsl115)

curl ftp://ftp.gnu.org/gnu/gsl/gsl-1.15.tar.gz > gsl-1.15.tar.gz
tar xvzf gsl-1.15.tar.gz
cd gsl-1.15
./configure
make
sudo make install
gem install gsl