* lib/Automake/Channels.pm (%_default_options): Add 'partial'. (_format_message): Rename as ... (_format_sub_message): ... this. (_format_message): New function, extracted from ... (_print_message): ... here. Honor the 'partial' option. ($partial): New variable. * automake.in (handle_ltlibraries, check_ambiguous_conditional, rule_define): Mark partial messages.