> If I run that command, it installs the gsl-1.13. I want to install gsl-1.16.
I suggest retrying the download of 1.16 then as your earlier one seemed to be corrupted (or else you somehow misissued the commands) You can download-and-unpack into the current directory in one step with curl ftp://ftp.gnu.org/gnu/gsl/gsl-1.16.tar.gz | tar xzv on the command line provided curl is installed. - Rhys