-XBT_PUBLIC void amok_pm_group_join(gras_socket_t master, const char *group_name);
-XBT_PUBLIC void amok_pm_group_leave(gras_socket_t master, const char *group_name);
+XBT_PUBLIC(void) amok_pm_group_join(gras_socket_t master, const char *group_name, int rank);
+XBT_PUBLIC(void) amok_pm_group_leave(gras_socket_t master, const char *group_name);