* lib/Automake/Variable.pm (hook): Use $$ as prototype, not $&. Perl 5.6.0 will not accept a reference sub reference for the latter. * automake.in (var_SUFFIXES_trigger): Adjust registration via Automake::Variabke::hook. (handle_texinfo_helper): Make sure `inner_expand => 1' appears on one line, so that Perl 5.6.0 does not complain about inner_expand being a bare identifier.