$OPENFLAGS |= $bit if eval {
      # Make sure that redefined die handlers do not cause problems
      # e.g. CGI::Carp
      local $SIG{__DIE__} = sub {};
      local $SIG{__WARN__} = sub {};
      local *CORE::GLOBAL::die = sub {};
      $bit = &$func();
      1;
    };