cc1: error: unrecognized command line option "-fvisibility=hidden"
$ gcc --version gcc (GCC) 3.4.6 [FreeBSD] 20060305 Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# cd /usr/ports/lang/gcc49 # make install clean