diff '--color=auto' -ur a/librpc/svc.c b/librpc/svc.c
--- a/librpc/svc.c	2012-04-19 19:40:08.000000000 +0200
+++ b/librpc/svc.c	2025-05-31 02:30:07.186874175 +0200
@@ -73,7 +73,7 @@
 	struct svc_callout *sc_next;
 	unsigned long sc_prog;
 	unsigned long sc_vers;
-	void (*sc_dispatch) ();
+	__dispatch_fn_t sc_dispatch;
 } *svc_head;
 
 static struct svc_callout *svc_find(unsigned long prog, unsigned long vers, struct svc_callout **prev);
@@ -139,7 +139,7 @@
 SVCXPRT *xprt;
 unsigned long prog;
 unsigned long vers;
-void (*dispatch) ();
+__dispatch_fn_t dispatch;
 rpcprot_t protocol;
 {
 	struct svc_callout *prev;
diff '--color=auto' -ur a/librpc/svc_auth.c b/librpc/svc_auth.c
--- a/librpc/svc_auth.c	2003-08-19 21:34:18.000000000 +0200
+++ b/librpc/svc_auth.c	2025-05-31 02:32:12.422500534 +0200
@@ -56,12 +56,14 @@
  *
  */
 
-enum auth_stat _svcauth_null(void);		/* no authentication */
-enum auth_stat _svcauth_unix();		/* unix style (uid, gids) */
-enum auth_stat _svcauth_short();	/* short hand unix style */
+enum auth_stat _svcauth_null(struct svc_req*, struct rpc_msg*);		/* no authentication */
+enum auth_stat _svcauth_unix(struct svc_req*, struct rpc_msg*);		/* unix style (uid, gids) */
+enum auth_stat _svcauth_short(struct svc_req*, struct rpc_msg*);	/* short hand unix style */
+
+typedef enum auth_stat (*__auth_stat_fn_t) (struct svc_req*, struct rpc_msg*);
 
 static struct {
-	enum auth_stat (*authenticator) ();
+	__auth_stat_fn_t authenticator;
 } svcauthsw[] = {
 	{ _svcauth_null },			/* AUTH_NULL */
 	{ _svcauth_unix },			/* AUTH_UNIX */
@@ -106,9 +108,9 @@
 	return (AUTH_REJECTEDCRED);
 }
 
-enum auth_stat _svcauth_null( void/*rqst, msg */ )
-	/*struct svc_req *rqst;
-	   struct rpc_msg *msg; */
+enum auth_stat _svcauth_null( rqst, msg )
+	struct svc_req *rqst;
+	struct rpc_msg *msg;
 {
 
 	return (AUTH_OK);
diff '--color=auto' -ur a/librpc/svc_simple.c b/librpc/svc_simple.c
--- a/librpc/svc_simple.c	2016-03-29 17:56:33.000000000 +0200
+++ b/librpc/svc_simple.c	2025-05-31 02:36:01.221510124 +0200
@@ -48,7 +48,7 @@
 #include <string.h>
 
 static struct proglst {
-	char *(*p_progname) ();
+	char *(*p_progname) (char *xdrbuf);
 	int p_prognum;
 	int p_procnum;
 	xdrproc_t p_inproc, p_outproc;
@@ -58,7 +58,7 @@
 static SVCXPRT *transp;
 struct proglst *pl;
 
-static int registerrpc(int prognum, int versnum, int procnum, char *(*progname)(), xdrproc_t inproc, xdrproc_t outproc)
+static int registerrpc(int prognum, int versnum, int procnum, char *(*progname)(char*), xdrproc_t inproc, xdrproc_t outproc)
 {
 
 	if (procnum == NULLPROC) {