diff --git a/lib/libatm/libatm.h b/lib/libatm/libatm.h
index f3ffd3cda01b..61dd6ccb3014 100644
--- a/lib/libatm/libatm.h
+++ b/lib/libatm/libatm.h
@@ -85,15 +85,13 @@ extern int		get_hex_atm_addr(char *, u_char *, int);
 extern char		*format_atm_addr(Atm_addr *);
 
 /* cache_key.c */
-extern void		scsp_cache_key __P((Atm_addr *,
-				struct in_addr  *, int, char *));
+extern void		scsp_cache_key(Atm_addr *,
+				struct in_addr  *, int, char *);
 
 /* ioctl_subr.c */
 extern int		do_info_ioctl(struct atminfreq *, int);
-extern int		get_vcc_info __P((char *,
-				struct air_vcc_rsp **));
-extern int		get_subnet_mask __P((char *,
-				struct sockaddr_in *));
+extern int		get_vcc_info(char *, struct air_vcc_rsp **);
+extern int		get_subnet_mask(char *, struct sockaddr_in *);
 extern int		get_mtu(char *);
 extern int		verify_nif_name(char *);
 extern int		get_cfg_info(char *, struct air_cfg_rsp **);
diff --git a/lib/libc/db/btree/extern.h b/lib/libc/db/btree/extern.h
index e9def6d4b6d3..a151acca066f 100644
--- a/lib/libc/db/btree/extern.h
+++ b/lib/libc/db/btree/extern.h
@@ -53,8 +53,8 @@ int	 __bt_ret(BTREE *, EPG *, DBT *, DBT *, DBT *, DBT *, int);
 EPG	*__bt_search(BTREE *, const DBT *, int *);
 int	 __bt_seq(const DB *, DBT *, DBT *, u_int);
 void	 __bt_setcur(BTREE *, pgno_t, u_int);
-int	 __bt_split __P((BTREE *, PAGE *,
-	    const DBT *, const DBT *, int, size_t, u_int32_t));
+int	 __bt_split(BTREE *, PAGE *,
+	    const DBT *, const DBT *, int, size_t, u_int32_t);
 int	 __bt_sync(const DB *, u_int);
 
 int	 __ovfl_delete(BTREE *, void *);
diff --git a/lib/libc/db/hash/extern.h b/lib/libc/db/hash/extern.h
index 82bff428a9c8..9ae583265fa2 100644
--- a/lib/libc/db/hash/extern.h
+++ b/lib/libc/db/hash/extern.h
@@ -40,8 +40,8 @@ int	 __big_delete(HTAB *, BUFHEAD *);
 int	 __big_insert(HTAB *, BUFHEAD *, const DBT *, const DBT *);
 int	 __big_keydata(HTAB *, BUFHEAD *, DBT *, DBT *, int);
 int	 __big_return(HTAB *, BUFHEAD *, int, DBT *, int);
-int	 __big_split __P((HTAB *, BUFHEAD *, BUFHEAD *, BUFHEAD *,
-		int, u_int32_t, SPLIT_RETURN *));
+int	 __big_split(HTAB *, BUFHEAD *, BUFHEAD *, BUFHEAD *,
+		int, u_int32_t, SPLIT_RETURN *);
 int	 __buf_free(HTAB *, int, int);
 void	 __buf_init(HTAB *, int);
 u_int32_t	 __call_hash(HTAB *, char *, int);
diff --git a/lib/libc/db/hash/hash_func.c b/lib/libc/db/hash/hash_func.c
index aeb34b250c11..fd5f3655e5a9 100644
--- a/lib/libc/db/hash/hash_func.c
+++ b/lib/libc/db/hash/hash_func.c
@@ -53,7 +53,7 @@ static u_int32_t hash3(const void *, size_t);
 static u_int32_t hash4(const void *, size_t);
 
 /* Global default hash function */
-u_int32_t (*__default_hash) __P((const void *, size_t)) = hash4;
+u_int32_t (*__default_hash)(const void *, size_t) = hash4;
 
 /*
  * HASH FUNCTIONS
diff --git a/lib/libc/db/test/dbtest.c b/lib/libc/db/test/dbtest.c
index b403bc11e19b..b7c3c70c1aa0 100644
--- a/lib/libc/db/test/dbtest.c
+++ b/lib/libc/db/test/dbtest.c
@@ -64,7 +64,7 @@ enum S { COMMAND, COMPARE, GET, PUT, REMOVE, SEQ, SEQFLAG, KEY, DATA };
 void	 compare(DBT *, DBT *);
 DBTYPE	 dbtype(char *);
 void	 dump(DB *, int);
-void	 err __P((const char *, ...)) __printflike(1, 2);
+void	 err(const char *, ...) __printflike(1, 2);
 void	 get(DB *, DBT *);
 void	 getdata(DB *, DBT *, DBT *);
 void	 put(DB *, DBT *, DBT *);
diff --git a/lib/libc/gen/getcap.c b/lib/libc/gen/getcap.c
index cd2eaab1484a..a0e9803aa6c2 100644
--- a/lib/libc/gen/getcap.c
+++ b/lib/libc/gen/getcap.c
@@ -70,7 +70,7 @@ static char	*toprec;	/* Additional record specified by cgetset() */
 static int	 gottoprec;	/* Flag indicating retrieval of toprecord */
 
 static int	cdbget(DB *, char **, char *);
-static int 	getent(char **, u_int *, char **, int, char *, int, char *);
+static int 	getent(char **, u_int *, char **, int, const char *, int, char *);
 static int	nfcmp(char *, char *);
 
 /*
@@ -113,7 +113,8 @@ cgetset(const char *ent)
 char *
 cgetcap(char *buf, const char *cap, int type)
 {
-	char *bp, *cp;
+	char *bp;
+	const char *cp;
 
 	bp = buf;
 	for (;;) {
@@ -187,8 +188,8 @@ cgetent(char **buf, char **db_array, const char *name)
  *	  MAX_RECURSION.
  */
 static int
-getent(char **cap, u_int *len, char **db_array, int fd, char *name, int depth,
-    char *nfield)
+getent(char **cap, u_int *len, char **db_array, int fd, const char *name,
+    int depth, char *nfield)
 {
 	DB *capdbp;
 	char *r_end, *rp, **db_p;
diff --git a/lib/libc/net/getaddrinfo.c b/lib/libc/net/getaddrinfo.c
index e598bdba1be4..2e0cbb7d5392 100644
--- a/lib/libc/net/getaddrinfo.c
+++ b/lib/libc/net/getaddrinfo.c
@@ -218,18 +218,18 @@ struct res_target {
 };
 
 static int str_isnumber(const char *);
-static int explore_fqdn __P((const struct addrinfo *, const char *,
-	const char *, struct addrinfo **));
-static int explore_null __P((const struct addrinfo *,
-	const char *, struct addrinfo **));
-static int explore_numeric __P((const struct addrinfo *, const char *,
-	const char *, struct addrinfo **));
-static int explore_numeric_scope __P((const struct addrinfo *, const char *,
-	const char *, struct addrinfo **));
-static int get_canonname __P((const struct addrinfo *,
-	struct addrinfo *, const char *));
-static struct addrinfo *get_ai __P((const struct addrinfo *,
-	const struct afd *, const char *));
+static int explore_fqdn(const struct addrinfo *, const char *,
+	const char *, struct addrinfo **);
+static int explore_null(const struct addrinfo *,
+	const char *, struct addrinfo **);
+static int explore_numeric(const struct addrinfo *, const char *,
+	const char *, struct addrinfo **);
+static int explore_numeric_scope(const struct addrinfo *, const char *,
+	const char *, struct addrinfo **);
+static int get_canonname(const struct addrinfo *,
+	struct addrinfo *, const char *);
+static struct addrinfo *get_ai(const struct addrinfo *,
+	const struct afd *, const char *);
 static int get_portmatch(const struct addrinfo *, const char *);
 static int get_port(struct addrinfo *, const char *, int);
 static const struct afd *find_afd(int);
@@ -238,8 +238,8 @@ static int addrconfig(struct addrinfo *);
 static int ip6_str2scopeid(char *, struct sockaddr_in6 *);
 #endif
 
-static struct addrinfo *getanswer __P((const querybuf *, int, const char *, int,
-	const struct addrinfo *));
+static struct addrinfo *getanswer(const querybuf *, int, const char *, int,
+	const struct addrinfo *);
 static int _dns_getaddrinfo(void *, void *, va_list);
 static void _sethtent(void);
 static void _endhtent(void);
@@ -253,8 +253,8 @@ extern int _yp_check(char **);
 
 static int res_queryN(const char *, struct res_target *);
 static int res_searchN(const char *, struct res_target *);
-static int res_querydomainN __P((const char *, const char *,
-	struct res_target *));
+static int res_querydomainN(const char *, const char *,
+	struct res_target *);
 
 static char *ai_errlist[] = {
 	"Success",
diff --git a/lib/libc/net/getnameinfo.c b/lib/libc/net/getnameinfo.c
index f83cb9197cb8..7ca051c1f43d 100644
--- a/lib/libc/net/getnameinfo.c
+++ b/lib/libc/net/getnameinfo.c
@@ -81,8 +81,8 @@ struct sockinet {
 };
 
 #ifdef INET6
-static int ip6_parsenumeric __P((const struct sockaddr *, const char *, char *,
-				 size_t, int));
+static int ip6_parsenumeric(const struct sockaddr *, const char *, char *,
+	    size_t, int);
 static int ip6_sa2str(const struct sockaddr_in6 *, char *, size_t, int);
 #endif
 
diff --git a/lib/libc/net/inet_net_ntop.c b/lib/libc/net/inet_net_ntop.c
index 4b30cb69e859..215ff1d5ec7c 100644
--- a/lib/libc/net/inet_net_ntop.c
+++ b/lib/libc/net/inet_net_ntop.c
@@ -36,8 +36,8 @@ static const char rcsid[] = "$FreeBSD$";
 # define SPRINTF(x) ((size_t)sprintf x)
 #endif
 
-static char *	inet_net_ntop_ipv4 __P((const u_char *src, int bits,
-					char *dst, size_t size));
+static char *	inet_net_ntop_ipv4(const u_char *src, int bits, char *dst,
+		    size_t size);
 
 /*
  * char *
diff --git a/lib/libc/net/inet_net_pton.c b/lib/libc/net/inet_net_pton.c
index 04a45d43a641..5452d6868574 100644
--- a/lib/libc/net/inet_net_pton.c
+++ b/lib/libc/net/inet_net_pton.c
@@ -38,8 +38,7 @@ static const char rcsid[] = "$FreeBSD$";
 # define SPRINTF(x) ((size_t)sprintf x)
 #endif
 
-static int	inet_net_pton_ipv4 __P((const char *src, u_char *dst,
-					size_t size));
+static int	inet_net_pton_ipv4(const char *src, u_char *dst, size_t size);
 
 /*
  * static int
diff --git a/lib/libc/net/inet_ntop.c b/lib/libc/net/inet_ntop.c
index 9dbe46b83a89..4b1af695397c 100644
--- a/lib/libc/net/inet_ntop.c
+++ b/lib/libc/net/inet_ntop.c
@@ -38,10 +38,8 @@ __FBSDID("$FreeBSD$");
  * sizeof(int) < 4.  sizeof(int) > 4 is fine; all the world's not a VAX.
  */
 
-static const char *inet_ntop4 __P((const u_char *src, char *dst,
-    socklen_t size));
-static const char *inet_ntop6 __P((const u_char *src, char *dst,
-    socklen_t size));
+static const char *inet_ntop4(const u_char *src, char *dst, socklen_t size);
+static const char *inet_ntop6(const u_char *src, char *dst, socklen_t size);
 
 /* char *
  * inet_ntop(af, src, dst, size)
diff --git a/lib/libc/net/name6.c b/lib/libc/net/name6.c
index 405deda37315..2e445da5c67b 100644
--- a/lib/libc/net/name6.c
+++ b/lib/libc/net/name6.c
@@ -976,8 +976,8 @@ typedef union {
 	u_char buf[MAXPACKET];
 } querybuf;
 
-static struct hostent *getanswer __P((const querybuf *, int, const char *,
-	int, struct hostent *, int *));
+static struct hostent *getanswer(const querybuf *, int, const char *, int,
+	    struct hostent *, int *);
 
 /*
  * we don't need to take care about sorting, nor IPv4 mapped address here.
diff --git a/lib/libc/net/rcmd.c b/lib/libc/net/rcmd.c
index 91bdf288a779..19a1f1792ed7 100644
--- a/lib/libc/net/rcmd.c
+++ b/lib/libc/net/rcmd.c
@@ -72,13 +72,11 @@ extern int innetgr( const char *, const char *, const char *, const char * );
 
 #define max(a, b)	((a > b) ? a : b)
 
-int	__ivaliduser(FILE *, u_int32_t, const char *, const char *);
-int __ivaliduser_af __P((FILE *,const void *, const char *, const char *,
-	int, int));
-int __ivaliduser_sa __P((FILE *, const struct sockaddr *, socklen_t,
-	const char *,const char *));
-static int __icheckhost __P((const struct sockaddr *, socklen_t,
-	const char *));
+int __ivaliduser(FILE *, u_int32_t, const char *, const char *);
+int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int);
+int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *,
+    const char *);
+static int __icheckhost(const struct sockaddr *, socklen_t, const char *);
 
 char paddr[NI_MAXHOST];
 
diff --git a/lib/libc/rpc/clnt_dg.c b/lib/libc/rpc/clnt_dg.c
index fdc9c879c434..6ea9756f1b21 100644
--- a/lib/libc/rpc/clnt_dg.c
+++ b/lib/libc/rpc/clnt_dg.c
@@ -69,8 +69,8 @@ static char sccsid[] = "@(#)clnt_dg.c 1.19 89/03/16 Copyr 1988 Sun Micro";
 
 static struct clnt_ops *clnt_dg_ops(void);
 static bool_t time_not_ok(struct timeval *);
-static enum clnt_stat clnt_dg_call __P((CLIENT *, rpcproc_t, xdrproc_t, caddr_t,
-					xdrproc_t, caddr_t, struct timeval));
+static enum clnt_stat clnt_dg_call(CLIENT *, rpcproc_t, xdrproc_t, caddr_t,
+	    xdrproc_t, caddr_t, struct timeval);
 static void clnt_dg_geterr(CLIENT *, struct rpc_err *);
 static bool_t clnt_dg_freeres(CLIENT *, xdrproc_t, caddr_t);
 static void clnt_dg_abort(CLIENT *);
diff --git a/lib/libc/rpc/clnt_raw.c b/lib/libc/rpc/clnt_raw.c
index 1492e485bffb..d37da5d06603 100644
--- a/lib/libc/rpc/clnt_raw.c
+++ b/lib/libc/rpc/clnt_raw.c
@@ -76,8 +76,8 @@ static struct clntraw_private {
 	u_int	mcnt;
 } *clntraw_private;
 
-static enum clnt_stat clnt_raw_call __P((CLIENT *, rpcproc_t, xdrproc_t,
-    caddr_t, xdrproc_t, caddr_t, struct timeval));
+static enum clnt_stat clnt_raw_call(CLIENT *, rpcproc_t, xdrproc_t, caddr_t,
+	xdrproc_t, caddr_t, struct timeval);
 static void clnt_raw_geterr(CLIENT *, struct rpc_err *);
 static bool_t clnt_raw_freeres(CLIENT *, xdrproc_t, caddr_t);
 static void clnt_raw_abort(CLIENT *);
diff --git a/lib/libc/rpc/clnt_vc.c b/lib/libc/rpc/clnt_vc.c
index 27f14d97ea7b..4e9fd4f4a79c 100644
--- a/lib/libc/rpc/clnt_vc.c
+++ b/lib/libc/rpc/clnt_vc.c
@@ -87,8 +87,8 @@ struct cmessage {
         struct cmsgcred cmcred;
 };
 
-static enum clnt_stat clnt_vc_call __P((CLIENT *, rpcproc_t, xdrproc_t, caddr_t,
-    xdrproc_t, caddr_t, struct timeval));
+static enum clnt_stat clnt_vc_call(CLIENT *, rpcproc_t, xdrproc_t, caddr_t,
+    xdrproc_t, caddr_t, struct timeval);
 static void clnt_vc_geterr(CLIENT *, struct rpc_err *);
 static bool_t clnt_vc_freeres(CLIENT *, xdrproc_t, caddr_t);
 static void clnt_vc_abort(CLIENT *);
diff --git a/lib/libc/rpc/rpc_com.h b/lib/libc/rpc/rpc_com.h
index a52332dabff6..b04f1109a0f0 100644
--- a/lib/libc/rpc/rpc_com.h
+++ b/lib/libc/rpc/rpc_com.h
@@ -73,9 +73,8 @@ int __rpc_socktype2seman(int);
 void *rpc_nullproc(CLIENT *);
 int __rpc_sockisbound(int);
 
-struct netbuf *__rpcb_findaddr __P((rpcprog_t, rpcvers_t,
-				    const struct netconfig *,
-				    const char *, CLIENT **));
+struct netbuf *__rpcb_findaddr(rpcprog_t, rpcvers_t, const struct netconfig *,
+    const char *, CLIENT **);
 bool_t __rpc_control(int,void *);
 
 char *_get_next_token(char *, int);
diff --git a/lib/libc/rpc/rpc_soc.c b/lib/libc/rpc/rpc_soc.c
index 9618de176599..8df05290bf84 100644
--- a/lib/libc/rpc/rpc_soc.c
+++ b/lib/libc/rpc/rpc_soc.c
@@ -78,8 +78,8 @@ static char sccsid[] = "@(#)rpc_soc.c 1.41 89/05/02 Copyr 1988 Sun Micro";
 
 extern mutex_t	rpcsoc_lock;
 
-static CLIENT *clnt_com_create __P((struct sockaddr_in *, rpcprog_t, rpcvers_t,
-				    int *, u_int, u_int, char *));
+static CLIENT *clnt_com_create(struct sockaddr_in *, rpcprog_t, rpcvers_t,
+    int *, u_int, u_int, char *);
 static SVCXPRT *svc_com_create(int, u_int, u_int, char *);
 static bool_t rpc_wrap_bcast(char *, struct netbuf *, struct netconfig *);
 
diff --git a/lib/libc/rpc/rpcb_clnt.c b/lib/libc/rpc/rpcb_clnt.c
index 156cbe82ad1e..416ab2230cce 100644
--- a/lib/libc/rpc/rpcb_clnt.c
+++ b/lib/libc/rpc/rpcb_clnt.c
@@ -102,13 +102,10 @@ extern int __rpc_lowvers;
 
 static struct address_cache *check_cache(const char *, const char *);
 static void delete_cache(struct netbuf *);
-static void add_cache __P((const char *, const char *, struct netbuf *,
-			   char *));
-static CLIENT *getclnthandle __P((const char *, const struct netconfig *,
-				  char **));
+static void add_cache(const char *, const char *, struct netbuf *, char *);
+static CLIENT *getclnthandle(const char *, const struct netconfig *, char **);
 static CLIENT *local_rpcb(void);
-static struct netbuf *got_entry __P((rpcb_entry_list_ptr,
-				     const struct netconfig *));
+static struct netbuf *got_entry(rpcb_entry_list_ptr, const struct netconfig *);
 
 /*
  * This routine adjusts the timeout used for calls to the remote rpcbind.
diff --git a/lib/libc/rpc/svc.c b/lib/libc/rpc/svc.c
index c201c0c2957c..5f131b2e5697 100644
--- a/lib/libc/rpc/svc.c
+++ b/lib/libc/rpc/svc.c
@@ -88,8 +88,8 @@ static struct svc_callout {
 extern rwlock_t svc_lock;
 extern rwlock_t svc_fd_lock;
 
-static struct svc_callout *svc_find __P((rpcprog_t, rpcvers_t,
-					 struct svc_callout **, char *));
+static struct svc_callout *svc_find(rpcprog_t, rpcvers_t,
+    struct svc_callout **, char *);
 
 /* ***************  SVCXPRT related stuff **************** */
 
diff --git a/lib/libc/rpc/svc_vc.c b/lib/libc/rpc/svc_vc.c
index 731f5c75c0c2..8fea82ec4cf4 100644
--- a/lib/libc/rpc/svc_vc.c
+++ b/lib/libc/rpc/svc_vc.c
@@ -613,11 +613,11 @@ svc_vc_rendezvous_ops(xprt)
 		ops.xp_recv = rendezvous_request;
 		ops.xp_stat = rendezvous_stat;
 		ops.xp_getargs =
-		    (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort;
+		    (bool_t (*)(SVCXPRT *, xdrproc_t, caddr_t))abort;
 		ops.xp_reply =
-		    (bool_t (*) __P((SVCXPRT *, struct rpc_msg *)))abort;
+		    (bool_t (*)(SVCXPRT *, struct rpc_msg *))abort;
 		ops.xp_freeargs =
-		    (bool_t (*) __P((SVCXPRT *, xdrproc_t, caddr_t)))abort,
+		    (bool_t (*)(SVCXPRT *, xdrproc_t, caddr_t))abort,
 		ops.xp_destroy = svc_vc_destroy;
 		ops2.xp_control = svc_vc_control;
 	}
diff --git a/lib/libc/stdio/vfprintf.c b/lib/libc/stdio/vfprintf.c
index 1d04528e9ced..4902d8cb5739 100644
--- a/lib/libc/stdio/vfprintf.c
+++ b/lib/libc/stdio/vfprintf.c
@@ -113,11 +113,11 @@ enum typeid {
 };
 
 static int	__sprint(FILE *, struct __suio *);
-static int	__sbprintf __P((FILE *, const char *, va_list)) __printflike(2, 0);
-static char	*__ujtoa __P((uintmax_t, char *, int, int, char *, int,
-		     char, const char *));
-static char	*__ultoa __P((u_long, char *, int, int, char *, int,
-		     char, const char *));
+static int	__sbprintf(FILE *, const char *, va_list) __printflike(2, 0);
+static char	*__ujtoa(uintmax_t, char *, int, int, char *, int, char,
+		    const char *);
+static char	*__ultoa(u_long, char *, int, int, char *, int, char,
+		    const char *);
 static void	__find_arguments(const char *, va_list, union arg **);
 static void	__grow_type_table(int, enum typeid **, int *);
 
diff --git a/lib/libc/stdlib/radixsort.c b/lib/libc/stdlib/radixsort.c
index 9540f6365a5c..de5cd4b67d4e 100644
--- a/lib/libc/stdlib/radixsort.c
+++ b/lib/libc/stdlib/radixsort.c
@@ -66,8 +66,8 @@ typedef struct {
 static inline void simplesort
 (const u_char **, int, int, const u_char *, u_int);
 static void r_sort_a(const u_char **, int, int, const u_char *, u_int);
-static void r_sort_b __P((const u_char **,
-	    const u_char **, int, int, const u_char *, u_int));
+static void r_sort_b(const u_char **, const u_char **, int, int,
+    const u_char *, u_int);
 
 #define	THRESHOLD	20		/* Divert to simplesort(). */
 #define	SIZE		512		/* Default stack size. */
diff --git a/lib/libc/stdlib/twalk.c b/lib/libc/stdlib/twalk.c
index 78d368511e8e..78be57d6c12c 100644
--- a/lib/libc/stdlib/twalk.c
+++ b/lib/libc/stdlib/twalk.c
@@ -22,8 +22,8 @@ __RCSID("$NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $");
 #include <search.h>
 #include <stdlib.h>
 
-static void trecurse __P((const node_t *,
-    void  (*action)(const void *, VISIT, int), int level));
+static void trecurse(const node_t *,
+    void (*action)(const void *, VISIT, int), int level);
 
 /* Walk the nodes of a tree */
 static void
diff --git a/lib/libipsec/ipsec_dump_policy.c b/lib/libipsec/ipsec_dump_policy.c
index 6fca965a1c0c..721ff207200b 100644
--- a/lib/libipsec/ipsec_dump_policy.c
+++ b/lib/libipsec/ipsec_dump_policy.c
@@ -57,10 +57,9 @@ static const char *ipsp_policy_strs[] = {
 	"discard", "none", "ipsec", "entrust", "bypass",
 };
 
-static char *ipsec_dump_ipsecrequest __P((char *, size_t,
-	struct sadb_x_ipsecrequest *, size_t));
-static int set_addresses __P((char *, size_t, struct sockaddr *,
-	struct sockaddr *));
+static char *ipsec_dump_ipsecrequest(char *, size_t,
+	struct sadb_x_ipsecrequest *, size_t);
+static int set_addresses(char *, size_t, struct sockaddr *, struct sockaddr *);
 static char *set_address(char *, size_t, struct sockaddr *);
 
 /*
diff --git a/lib/libipsec/libpfkey.h b/lib/libipsec/libpfkey.h
index 79cbe7a7b463..07ff582ec827 100644
--- a/lib/libipsec/libpfkey.h
+++ b/lib/libipsec/libpfkey.h
@@ -41,44 +41,40 @@ int ipsec_check_keylen2(u_int, u_int, u_int);
 int ipsec_get_keylen(u_int, u_int, struct sadb_alg *);
 u_int pfkey_set_softrate(u_int, u_int);
 u_int pfkey_get_softrate(u_int);
-int pfkey_send_getspi __P((int, u_int, u_int, struct sockaddr *,
-	struct sockaddr *, u_int32_t, u_int32_t, u_int32_t, u_int32_t));
-int pfkey_send_update __P((int, u_int, u_int, struct sockaddr *,
-	struct sockaddr *, u_int32_t, u_int32_t, u_int,
-	caddr_t, u_int, u_int, u_int, u_int, u_int, u_int32_t, u_int64_t,
-	u_int64_t, u_int64_t, u_int32_t));
-int pfkey_send_add __P((int, u_int, u_int, struct sockaddr *,
-	struct sockaddr *, u_int32_t, u_int32_t, u_int,
-	caddr_t, u_int, u_int, u_int, u_int, u_int, u_int32_t, u_int64_t,
-	u_int64_t, u_int64_t, u_int32_t));
-int pfkey_send_delete __P((int, u_int, u_int,
-	struct sockaddr *, struct sockaddr *, u_int32_t));
-int pfkey_send_delete_all __P((int, u_int, u_int,
-	struct sockaddr *, struct sockaddr *));
-int pfkey_send_get __P((int, u_int, u_int,
-	struct sockaddr *, struct sockaddr *, u_int32_t));
+int pfkey_send_getspi(int, u_int, u_int, struct sockaddr *, struct sockaddr *,
+	u_int32_t, u_int32_t, u_int32_t, u_int32_t);
+int pfkey_send_update(int, u_int, u_int, struct sockaddr *, struct sockaddr *,
+	u_int32_t, u_int32_t, u_int, caddr_t, u_int, u_int, u_int, u_int,
+	u_int, u_int32_t, u_int64_t, u_int64_t, u_int64_t, u_int32_t);
+int pfkey_send_add(int, u_int, u_int, struct sockaddr *, struct sockaddr *,
+	u_int32_t, u_int32_t, u_int, caddr_t, u_int, u_int, u_int, u_int,
+	u_int, u_int32_t, u_int64_t, u_int64_t, u_int64_t, u_int32_t);
+int pfkey_send_delete(int, u_int, u_int, struct sockaddr *, struct sockaddr *,
+	u_int32_t);
+int pfkey_send_delete_all(int, u_int, u_int, struct sockaddr *,
+	struct sockaddr *);
+int pfkey_send_get(int, u_int, u_int, struct sockaddr *, struct sockaddr *,
+	u_int32_t);
 int pfkey_send_register(int, u_int);
 int pfkey_recv_register(int);
 int pfkey_set_supported(struct sadb_msg *, int);
 int pfkey_send_flush(int, u_int);
 int pfkey_send_dump(int, u_int);
 int pfkey_send_promisc_toggle(int, int);
-int pfkey_send_spdadd __P((int, struct sockaddr *, u_int,
-	struct sockaddr *, u_int, u_int, caddr_t, int, u_int32_t));
-int pfkey_send_spdadd2 __P((int, struct sockaddr *, u_int,
-	struct sockaddr *, u_int, u_int, u_int64_t, u_int64_t,
-	caddr_t, int, u_int32_t));
-int pfkey_send_spdupdate __P((int, struct sockaddr *, u_int,
-	struct sockaddr *, u_int, u_int, caddr_t, int, u_int32_t));
-int pfkey_send_spdupdate2 __P((int, struct sockaddr *, u_int,
-	struct sockaddr *, u_int, u_int, u_int64_t, u_int64_t,
-	caddr_t, int, u_int32_t));
-int pfkey_send_spddelete __P((int, struct sockaddr *, u_int,
-	struct sockaddr *, u_int, u_int, caddr_t, int, u_int32_t));
+int pfkey_send_spdadd(int, struct sockaddr *, u_int, struct sockaddr *, u_int,
+	u_int, caddr_t, int, u_int32_t);
+int pfkey_send_spdadd2(int, struct sockaddr *, u_int, struct sockaddr *, u_int,
+	u_int, u_int64_t, u_int64_t, caddr_t, int, u_int32_t);
+int pfkey_send_spdupdate(int, struct sockaddr *, u_int, struct sockaddr *,
+	u_int, u_int, caddr_t, int, u_int32_t);
+int pfkey_send_spdupdate2(int, struct sockaddr *, u_int, struct sockaddr *,
+	u_int, u_int, u_int64_t, u_int64_t, caddr_t, int, u_int32_t);
+int pfkey_send_spddelete(int, struct sockaddr *, u_int, struct sockaddr *,
+	u_int, u_int, caddr_t, int, u_int32_t);
 int pfkey_send_spddelete2(int, u_int32_t);
 int pfkey_send_spdget(int, u_int32_t);
-int pfkey_send_spdsetidx __P((int, struct sockaddr *, u_int,
-	struct sockaddr *, u_int, u_int, caddr_t, int, u_int32_t));
+int pfkey_send_spdsetidx(int, struct sockaddr *, u_int, struct sockaddr *,
+	u_int, u_int, caddr_t, int, u_int32_t);
 int pfkey_send_spdflush(int);
 int pfkey_send_spddump(int);
 
diff --git a/lib/libipsec/pfkey.c b/lib/libipsec/pfkey.c
index b0d773f22383..42137f90e80c 100644
--- a/lib/libipsec/pfkey.c
+++ b/lib/libipsec/pfkey.c
@@ -54,27 +54,27 @@ __FBSDID("$FreeBSD$");
 static int findsupportedmap(int);
 static int setsupportedmap(struct sadb_supported *);
 static struct sadb_alg *findsupportedalg(u_int, u_int);
-static int pfkey_send_x1 __P((int, u_int, u_int, u_int, struct sockaddr *,
+static int pfkey_send_x1(int, u_int, u_int, u_int, struct sockaddr *,
 	struct sockaddr *, u_int32_t, u_int32_t, u_int, caddr_t,
 	u_int, u_int, u_int, u_int, u_int, u_int32_t, u_int32_t,
-	u_int32_t, u_int32_t, u_int32_t));
-static int pfkey_send_x2 __P((int, u_int, u_int, u_int,
-	struct sockaddr *, struct sockaddr *, u_int32_t));
+	u_int32_t, u_int32_t, u_int32_t);
+static int pfkey_send_x2(int, u_int, u_int, u_int,
+	struct sockaddr *, struct sockaddr *, u_int32_t);
 static int pfkey_send_x3(int, u_int, u_int);
-static int pfkey_send_x4 __P((int, u_int, struct sockaddr *, u_int,
+static int pfkey_send_x4(int, u_int, struct sockaddr *, u_int,
 	struct sockaddr *, u_int, u_int, u_int64_t, u_int64_t,
-	char *, int, u_int32_t));
+	char *, int, u_int32_t);
 static int pfkey_send_x5(int, u_int, u_int32_t);
 
-static caddr_t pfkey_setsadbmsg __P((caddr_t, caddr_t, u_int, u_int,
-	u_int, u_int32_t, pid_t));
-static caddr_t pfkey_setsadbsa __P((caddr_t, caddr_t, u_int32_t, u_int,
-	u_int, u_int, u_int32_t));
-static caddr_t pfkey_setsadbaddr __P((caddr_t, caddr_t, u_int,
-	struct sockaddr *, u_int, u_int));
+static caddr_t pfkey_setsadbmsg(caddr_t, caddr_t, u_int, u_int,
+	u_int, u_int32_t, pid_t);
+static caddr_t pfkey_setsadbsa(caddr_t, caddr_t, u_int32_t, u_int,
+	u_int, u_int, u_int32_t);
+static caddr_t pfkey_setsadbaddr(caddr_t, caddr_t, u_int,
+	struct sockaddr *, u_int, u_int);
 static caddr_t pfkey_setsadbkey(caddr_t, caddr_t, u_int, caddr_t, u_int);
-static caddr_t pfkey_setsadblifetime __P((caddr_t, caddr_t, u_int, u_int32_t,
-	u_int32_t, u_int32_t, u_int32_t));
+static caddr_t pfkey_setsadblifetime(caddr_t, caddr_t, u_int, u_int32_t,
+	u_int32_t, u_int32_t, u_int32_t);
 static caddr_t pfkey_setsadbxsa2(caddr_t, caddr_t, u_int32_t, u_int32_t);
 
 /*
diff --git a/lib/libkvm/kvm_private.h b/lib/libkvm/kvm_private.h
index b2fd4dd9fa9a..6afe9031c1a8 100644
--- a/lib/libkvm/kvm_private.h
+++ b/lib/libkvm/kvm_private.h
@@ -70,13 +70,14 @@ struct __kvm {
 /*
  * Functions used internally by kvm, but across kvm modules.
  */
-void	 _kvm_err __P((kvm_t *kd, const char *program, const char *fmt, ...)) __printflike(3, 4);
+void	 _kvm_err(kvm_t *kd, const char *program, const char *fmt, ...)
+	    __printflike(3, 4);
 void	 _kvm_freeprocs(kvm_t *kd);
 void	 _kvm_freevtop(kvm_t *);
 int	 _kvm_initvtop(kvm_t *);
 int	 _kvm_kvatop(kvm_t *, u_long, u_long *);
 void	*_kvm_malloc(kvm_t *kd, size_t);
 void	*_kvm_realloc(kvm_t *kd, void *, size_t);
-void	 _kvm_syserr
-	    __P((kvm_t *kd, const char *program, const char *fmt, ...)) __printflike(3, 4);
+void	 _kvm_syserr (kvm_t *kd, const char *program, const char *fmt, ...)
+	    __printflike(3, 4);
 int	 _kvm_uvatop(kvm_t *, const struct proc *, u_long, u_long *);
diff --git a/lib/libncp/ipx.c b/lib/libncp/ipx.c
index 38df700c5fb5..9371fddb5590 100644
--- a/lib/libncp/ipx.c
+++ b/lib/libncp/ipx.c
@@ -188,8 +188,9 @@ void ipx_assign_node(IPXNode *dest, IPXNode *src) {
 
 
 static void	rt_xaddrs(caddr_t, caddr_t, struct rt_addrinfo *);
-static int	if_ipxscan __P((int addrcount, struct sockaddr_dl *sdl, struct if_msghdr *ifm,
-		    struct ifa_msghdr *ifam,struct ipx_addr *addr));
+static int	if_ipxscan(int addrcount, struct sockaddr_dl *sdl,
+		    struct if_msghdr *ifm, struct ifa_msghdr *ifam,
+		    struct ipx_addr *addr);
 
 /*
  * Find an IPX interface. 
diff --git a/lib/libutil/libutil.h b/lib/libutil/libutil.h
index e24f37d5b150..e7067c42eda7 100644
--- a/lib/libutil/libutil.h
+++ b/lib/libutil/libutil.h
@@ -49,17 +49,16 @@ struct in_addr;
 
 __BEGIN_DECLS
 int	extattr_namespace_to_string(int _attrnamespace, char **_string);
-int	extattr_string_to_namespace __P((const char *_string,
-					 int *_attrnamespace));
+int	extattr_string_to_namespace(const char *_string, int *_attrnamespace);
 void	login(struct utmp *_ut);
 int	login_tty(int _fd);
 int	logout(const char *_line);
 void	logwtmp(const char *_line, const char *_name, const char *_host);
 void	trimdomain(char *_fullhost, int _hostsize);
-int	openpty __P((int *_amaster, int *_aslave, char *_name,
-		     struct termios *_termp, struct winsize *_winp));
-int	forkpty __P((int *_amaster, char *_name,
-		     struct termios *_termp, struct winsize *_winp));
+int	openpty(int *_amaster, int *_aslave, char *_name,
+		     struct termios *_termp, struct winsize *_winp);
+int	forkpty(int *_amaster, char *_name,
+		     struct termios *_termp, struct winsize *_winp);
 const char *uu_lockerr(int _uu_lockresult);
 int	uu_lock(const char *_ttyname);
 int	uu_unlock(const char *_ttyname);
@@ -71,8 +70,8 @@ char	*property_find(properties list, const char *name);
 char	*auth_getval(const char *name);
 int	realhostname(char *host, size_t hsize, const struct in_addr *ip);
 struct sockaddr;
-int	realhostname_sa __P((char *host, size_t hsize, struct sockaddr *addr,
-			     int addrlen));
+int	realhostname_sa(char *host, size_t hsize, struct sockaddr *addr,
+			     int addrlen);
 #ifdef _STDIO_H_	/* avoid adding new includes */
 char   *fparseln(FILE *, size_t *, size_t *, const char[3], int);
 #endif