allow users to disable GSL from the command line if they do not wish to link in GSL
allow users to disable GSL from the command line if they do not wish to link in GSL

sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata,sirikata/sirikata