error when build with httpd configure with --enable-maintainer-mode

you will get errors like:
+++
../include/node.h:241:1: error: function declaration isn’t a prototype [-Werror=strict-prototypes]
241 | void (*lock_nodes)();
+++
or:
+++
mod_proxy_cluster.c:2965:6: error: no previous prototype for ‘remove_session_route’ [-Werror=missing-prototypes]
2965 | void remove_session_route(request_rec *r, const char *name)