GSL Installation from source
curl -L https://ftp.gnu.org/gnu/gsl/gsl-2.6.tar.gz > gsl-2.6.tar.gz
tar xfv gsl-2.6.tar.gz
cd gsl-2.6
./configure
make
sudo make install
curl -L https://ftp.gnu.org/gnu/gsl/gsl-2.6.tar.gz > gsl-2.6.tar.gz
tar xfv gsl-2.6.tar.gz
cd gsl-2.6
./configure
make
sudo make install