C<VAR_ASIS>, C<VAR_PRETTY>, C<VAR_SILENT>, or C<VAR_SORTED>, defined by by L<Automake::VarDef>). C<$pretty> applies only to real
C<VAR_ASIS>, C<VAR_PRETTY>, C<VAR_SILENT>, or C<VAR_SORTED>, defined by by L<Automake::VarDef>). C<$pretty> applies only to real