the -fvisibility=hidden option - Update Makefile consequentially git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@361 3ecf2c5c-341e-0410-92b4-d18e462d057c
git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@318 3ecf2c5c-341e-0410-92b4-d18e462d057c