autoconf: If given --with-gtk2, not finding it is fatal.
autoconf: If given --with-gtk2, not finding it is fatal.

Use --with-gtk2=check (default) if you're ok with both cases.

Signed-off-by: Tommi Virtanen <9ab2264cc7e4806727ef3fc8f99e05b759bbf6e0@dreamhost.com>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph