depends dbus &&
optional_depends gtk-doc '--enable-gtk-doc' \
                         '--disable-gtk-doc --disable-gtk-doc-html' \
                         'for documentation' &&
optional_depends rarian '--enable-scrollkeeper' \
                        '--disable-scrollkeeper' \
                        'to register helpfiles with rarian' &&
optional_depends gtk+3 '--with-gtk=3 --enable-gtk' '' \
                       'use gtk+3 instead of gtk+2 or no gtk at all' &&
if ! is_depends_enabled $SPELL gtk+3 ; then
  optional_depends gtk+2 '--with-gtk=2 --enable-gtk' '--disable-gtk' \
                         'to build libdbusmenu-gtk'
fi &&
optional_depends gobject-introspection '--enable-introspection=yes' \
                                       '--enable-introspection=no' \
                                       'for introspection support' &&
optional_depends vala '--enable-vala' '--disable-vala' 'for vala support'