[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[int size = getgroups (0, 0);
gid_t *list = malloc (size * sizeof *list);
[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
[[int size = getgroups (0, 0);
gid_t *list = malloc (size * sizeof *list);