diff --git a/sj3dic/codecnv.c b/sj3dic/codecnv.c
index fdf587c..1e3237f 100644
--- a/sj3dic/codecnv.c
+++ b/sj3dic/codecnv.c
@@ -44,6 +44,7 @@
 
 static	int	euc_mode;
 
+int
 init_code()
 {
 	char *loc;
@@ -74,6 +75,7 @@ init_code()
 	return 1;
 }
 
+void
 cnvcode(s)
 unsigned char	*s;
 {
@@ -110,6 +112,7 @@ unsigned char	*s;
 	}
 }
 
+void
 printout_mb(fp, s)
 FILE    *fp;
 unsigned char   *s;
@@ -118,6 +121,7 @@ unsigned char   *s;
 	fflush(fp);
 }
 
+void
 printout(fp, s) 
 FILE	*fp;
 unsigned char	*s;
@@ -132,6 +136,7 @@ unsigned char	*s;
 	fflush(fp);
 }
 
+void
 normal_out(fmt, p1, p2, p3, p4, p5)
 char	*fmt;
 int	p1, p2, p3, p4, p5;
@@ -142,6 +147,7 @@ int	p1, p2, p3, p4, p5;
 	printout(stdout, buf);
 }
 
+void
 error_out(fmt, p1, p2, p3, p4, p5)
 char	*fmt;
 int	p1, p2, p3, p4, p5;
diff --git a/sj3dic/dictdisp.c b/sj3dic/dictdisp.c
index cc97b70..b2eb146 100644
--- a/sj3dic/dictdisp.c
+++ b/sj3dic/dictdisp.c
@@ -39,6 +39,7 @@
 #include <stdio.h>
 #include <ctype.h>
 
+void
 dictdisp(output)
 char	*output;
 {
diff --git a/sj3dic/dictmake.c b/sj3dic/dictmake.c
index 1ee0c74..d832627 100644
--- a/sj3dic/dictmake.c
+++ b/sj3dic/dictmake.c
@@ -135,6 +135,7 @@ char	*y, *k, *h;
 	}
 }
 
+void
 dictmake(input)
 char	*input;
 {
diff --git a/sj3dic/sj3err.c b/sj3dic/sj3err.c
index 366c4d4..1a6110a 100644
--- a/sj3dic/sj3err.c
+++ b/sj3dic/sj3err.c
@@ -39,6 +39,7 @@
 #include <stdio.h>
 #include "sj3err.h"
 
+void
 sj3error(fp, code)
 FILE	*fp;
 int	code;
diff --git a/sj3dic/sjrc.c b/sj3dic/sjrc.c
index 492890c..e556a51 100644
--- a/sj3dic/sjrc.c
+++ b/sj3dic/sjrc.c
@@ -59,6 +59,7 @@ static char	*rcfile = ".sjrc";
 static int	user_euc = 0;
 static int	file_code = SYS_SJIS;	
 
+void	setrc();
 int	set_dict(), set_server();
 
 struct functbl {
@@ -73,6 +74,7 @@ struct functbl {
 
 #define TOLOWER(c) (isupper(c) ? tolower(c) : (c))	
 
+int
 sjset_code()
 {
 	char *loc;
@@ -106,6 +108,7 @@ sjset_code()
 }
 	
 
+int
 getsjrc ()
 {
 	FILE *fd;
@@ -140,6 +143,7 @@ getsjrc ()
 }
 
 
+void
 setrc (file, fd)
 char	*file;
 FILE	*fd;
@@ -166,6 +170,7 @@ FILE	*fd;
 }
 
 
+int
 much(s1, s2)
 char *s1, *s2;
 {
@@ -183,6 +188,7 @@ char *s1, *s2;
 }
 
 
+int
 getword (s, word)
 register char	*s;
 struct wordent	word[];
@@ -272,36 +278,42 @@ struct wordent	word[];
 	return wcount;
 }
 
+int
 IsTerminator (c)
 u_char	c;
 {
 	return (c == '\n') ? 1 : 0;
 }
 
+int
 isTerminator (c)
 u_char	c;
 {
 	return (c == '#') ? 1 : 0;
 }
 
+int
 IsEscape (c)
 u_char	c;
 {
 	return (c == '\\') ? 1 : 0;
 }
 
+int
 IsDelimitor (c)
 u_char	c;
 {
 	return (c == ' ' || c == '\t' || c == '.') ? 1 : 0;
 }
 
+int
 set_dict (word)
 struct wordent	word[];
 {
 	setdicname(word[1].word_str);
 }
 
+int
 set_server(word)
 struct wordent	word[];
 {
diff --git a/sj3lib/string.c b/sj3lib/string.c
index b68044a..8a356c6 100644
--- a/sj3lib/string.c
+++ b/sj3lib/string.c
@@ -63,6 +63,8 @@
 unsigned short sjis2euc(), euc2sjis();
 #endif
 
+void sj_sjis2jis(), sj_jis2sjis();
+
 int
 sj3_str_sjistoeuc(out, outlen, in, sjis_default, useflag)
 unsigned char *out, *in, *sjis_default;
@@ -207,6 +209,7 @@ int slen, elen;
 	return sj3_str_euctosjis(s, slen, e, def_char, &dummy);
 }
 
+void
 sj_euc2sjis (s)
 unsigned char *s;
 {
@@ -215,6 +218,7 @@ unsigned char *s;
         sj_jis2sjis (s);
 }
 
+void
 sj_jis2sjis (s)
 unsigned char  *s;
 {
@@ -237,6 +241,7 @@ unsigned char  *s;
         s[1] = nl;
 }
 
+void
 sj_sjis2euc (s)
 unsigned char  *s;
 {
@@ -245,6 +250,7 @@ unsigned char  *s;
         s[1] |= MSB;
 }
 
+void
 sj_sjis2jis (s)
 unsigned char  *s;
 {