Index: libcio/conin.c
===================================================================
--- libcio/conin.c	(revision 599d89b3d3e576167c9066cfd2530b2824dc2bff)
+++ libcio/conin.c	(revision 0292fbb837057344b92e839b5e70c803241f361b)
@@ -14,5 +14,5 @@
 #include "stddefs.h"
 
-extern	char	*memcpy(char *s1, char *s2, int n);
+extern	void	*memcpy(void *vp1, void *vp2, int n);
 extern	int	readbuf(int dev, char *buf);
 extern	void	writeln(int unit, char *buf);
Index: libcio/read.c
===================================================================
--- libcio/read.c	(revision 599d89b3d3e576167c9066cfd2530b2824dc2bff)
+++ libcio/read.c	(revision 0292fbb837057344b92e839b5e70c803241f361b)
@@ -50,5 +50,5 @@
 extern	int	_seek(struct fcb *fcp);
 
-extern	char	*memcpy(char *s1, char *s2, int n);
+extern	void	*memcpy(void *vp1, void *vp2, int n);
 
 int	_filerd(struct fcb *fp, char *buffer, unsigned len);
Index: libcio/write.c
===================================================================
--- libcio/write.c	(revision 599d89b3d3e576167c9066cfd2530b2824dc2bff)
+++ libcio/write.c	(revision 0292fbb837057344b92e839b5e70c803241f361b)
@@ -26,5 +26,5 @@
 extern	long	miconl(long wi);
 
-extern	char	*memset(char *sp, char c, int n);
+extern	void	*memset(void *vp, char c, int n);
 
 extern	int	_fatmod;