diff --git a/sys/i386/isa/pcvt/pcvt_drv.c b/sys/i386/isa/pcvt/pcvt_drv.c
index 3b9bd042b315..4060aaae9584 100644
--- a/sys/i386/isa/pcvt/pcvt_drv.c
+++ b/sys/i386/isa/pcvt/pcvt_drv.c
@@ -83,6 +83,8 @@
 
 #include "pcvt_hdr.h"		/* global include */
 
+extern int getchar __P((void));
+
 #if PCVT_NETBSD
 	extern u_short *Crtat;
 #endif /* PCVT_NETBSD */
diff --git a/sys/i386/isa/pcvt/pcvt_kbd.c b/sys/i386/isa/pcvt/pcvt_kbd.c
index eda2d0877175..fbd168eba4c0 100644
--- a/sys/i386/isa/pcvt/pcvt_kbd.c
+++ b/sys/i386/isa/pcvt/pcvt_kbd.c
@@ -71,6 +71,8 @@
 
 #include "pcvt_hdr.h"		/* global include */
 
+extern int kbd_response __P((void));
+
 static void fkey1(void), fkey2(void),  fkey3(void),  fkey4(void);
 static void fkey5(void), fkey6(void),  fkey7(void),  fkey8(void);
 static void fkey9(void), fkey10(void), fkey11(void), fkey12(void);
@@ -658,7 +660,7 @@ xlatkey2ascii(U_short key)
 #endif
 	static Ovl_tbl	thisdef;
 	int		n;
-	void		(*fnc)();
+	void		(*fnc)(void);
 
 	if(key==0)			/* ignore the NON-KEY */
 		return 0;
diff --git a/sys/i386/isa/pcvt/pcvt_out.c b/sys/i386/isa/pcvt/pcvt_out.c
index 93b1ad9f089e..758db0a95a0a 100644
--- a/sys/i386/isa/pcvt/pcvt_out.c
+++ b/sys/i386/isa/pcvt/pcvt_out.c
@@ -69,6 +69,7 @@
 extern u_short csd_ascii[];	/* pcvt_tbl.h */
 extern u_short csd_supplemental[];
 
+static void write_char (struct video_state *svsp, int attrib, int ch);
 static void check_scroll ( struct video_state *svsp );
 static void hp_entry ( U_char ch, struct video_state *svsp );
 static void vt_coldinit ( void );
@@ -84,7 +85,7 @@ static void writefkl ( int num, u_char *string, struct video_state *svsp );
 
 static __inline void write_char (svsp, attrib, ch)
 struct	video_state *svsp;
-u_short	attrib, ch;
+u_short	attrib, ch;		/* XXX inefficient interface */
 {
 	if ((ch >= 0x20) && (ch <= 0x7f))	/* use GL if ch >= 0x20 */
 	{