- minimum|yes) gtkmm_warning_flags='-Wall -Wno-unused-parameter';;
- maximum) gtkmm_warning_flags='-W -Wall -Wno-unused-parameter';;
- hardcore) gtkmm_warning_flags='-W -Wall -Werror -Wno-unused-parameter';;
+ minimum|yes) gtkmm_warning_flags='-Wall';;
+ maximum) gtkmm_warning_flags='-Wall -W';;
+ hardcore) gtkmm_warning_flags='-Wall -W -Werror';;