New API in glibmm 2.8

Member Glib::OptionEntry::FILENAME

Member Glib::OptionEntry::NO_ARG

Member Glib::OptionEntry::NOALIAS

Member Glib::OptionEntry::OPTIONAL_ARG

Member Glib::STATIC_BLURB

Member Glib::STATIC_NAME

Member Glib::STATIC_NICK