diff --git a/sj3/nmttyslot.c b/sj3/nmttyslot.c
index 5aaa172..7429962 100644
--- a/sj3/nmttyslot.c
+++ b/sj3/nmttyslot.c
@@ -40,14 +40,13 @@
 
 
 
+#include <string.h>
+#include <unistd.h>
 
 
 
 
-
-char	*ttyname();
-char	*getttys();
-char	*strrchr();
+static char	*getttys();
 static	char	*ttys	= "/etc/ttys";
 
 #define	NULL	0
diff --git a/sj3dic/codecnv.c b/sj3dic/codecnv.c
index a7a0f04..968e980 100644
--- a/sj3dic/codecnv.c
+++ b/sj3dic/codecnv.c
@@ -35,7 +35,7 @@
 
 
 
-
+#include <string.h>
 #include <stdio.h>
 #include <ctype.h>
 #include <locale.h>
diff --git a/sj3dic/dictdisp.c b/sj3dic/dictdisp.c
index 5d5455d..cc97b70 100644
--- a/sj3dic/dictdisp.c
+++ b/sj3dic/dictdisp.c
@@ -35,7 +35,7 @@
 
 
 
-
+#include <string.h>
 #include <stdio.h>
 #include <ctype.h>
 
diff --git a/sj3dic/sjrc.c b/sj3dic/sjrc.c
index 438cfb0..492890c 100644
--- a/sj3dic/sjrc.c
+++ b/sj3dic/sjrc.c
@@ -36,7 +36,7 @@
 
 
 
-
+#include <string.h>
 #include <stdio.h>
 #include <locale.h>
 #include <ctype.h>
@@ -108,9 +108,8 @@ sjset_code()
 
 getsjrc ()
 {
-	FILE *fd, *fopen();
+	FILE *fd;
 	register char *p;
-	char *getenv();
 
 	sjset_code();
 	RCfile[0] = '\0';
diff --git a/sj3rkcv/sj3_rkcv.c b/sj3rkcv/sj3_rkcv.c
index b5a8374..8459032 100644
--- a/sj3rkcv/sj3_rkcv.c
+++ b/sj3rkcv/sj3_rkcv.c
@@ -33,7 +33,7 @@
  * $SonyDate: 1995/02/10 06:02:25 $
  */
 
-
+#include <string.h>
 
 #include "wchar16.h"
 #include "sj.h"