diff --git a/addelcmn.c b/addelcmn.c
index 8d1c520..3d5ea99 100644
--- a/addelcmn.c
+++ b/addelcmn.c
@@ -34,8 +34,10 @@
 #include "sj_yomi.h"
 #include "kanakan.h"
 
-int  sj2cd_str();
-void mvmemi(), mvmemd(), mkidxtbl();
+int sj2cd_str(unsigned char * euc, unsigned char * yomi, int len);
+void mvmemi(unsigned char * src, unsigned char * dest, int len);
+void mvmemd(unsigned char * src, unsigned char * dest, int len);
+void mkidxtbl(DICT * dict);
 
 void set_size(unsigned char* p, int size, int plen, int nlen) {
 	*p = (unsigned char)(size >> 8);
diff --git a/cl2knj.c b/cl2knj.c
index 473d50f..e836ba2 100644
--- a/cl2knj.c
+++ b/cl2knj.c
@@ -31,8 +31,9 @@
 #include "sj_kcnv.h"
 #include "kanakan.h"
 
-int  sj2cd_chr();
-void cvtclknj(), freework();
+int sj2cd_chr(unsigned char * euc, unsigned char * yomi);
+void cvtclknj(void);
+void freework(void);
 
 static CLREC* nextrecblk(void);
 static CLREC* prevrecblk(void);
diff --git a/clstudy.c b/clstudy.c
index e1d4642..58e8e72 100644
--- a/clstudy.c
+++ b/clstudy.c
@@ -32,8 +32,9 @@
 #include "sj_kcnv.h"
 #include "kanakan.h"
 
-int  sj2cd_str();
-void mvmemd(), mvmemi();
+int sj2cd_str(unsigned char * euc, unsigned char * yomi, int len);
+void mvmemd(unsigned char * src, unsigned char * dest, int len);
+void mvmemi(unsigned char * src, unsigned char * dest, int len);
 
 static unsigned char* delcldata(unsigned char* ycode);
 static int	      delclold(void);
diff --git a/code.c b/code.c
index bb73e1e..91859ff 100644
--- a/code.c
+++ b/code.c
@@ -44,7 +44,7 @@ static int	     ccnt = 0;
 int codeconv(wchar16_t c, unsigned int * rkstr)
 {
 	unsigned short ccode, i;
-	unsigned short CheckCcode();
+	unsigned short CheckCcode(wchar16_t c);
 	extern int     erase_char;
 
 	if(c == erase_char) {
diff --git a/common.h b/common.h
index e1943d9..b11a137 100644
--- a/common.h
+++ b/common.h
@@ -39,8 +39,8 @@ extern int Hlevel;
 extern int oasys;
 extern int flush_conversion;
 
-Conversion* AllocConversion();
-Conversion* GetConversion();
+Conversion* AllocConversion(void);
+Conversion* GetConversion(void);
 
 #ifdef DEBUG
 FILE* dbfp;
diff --git a/cvtclknj.c b/cvtclknj.c
index 4d68343..49e46d2 100644
--- a/cvtclknj.c
+++ b/cvtclknj.c
@@ -29,7 +29,8 @@
 
 #include "sj_kcnv.h"
 
-void cvtkouho(), setstyrec();
+void cvtkouho(KHREC* krec);
+void setstyrec(KHREC* krec);
 void cvtclknj(void)
 {
 	KHREC* krec;
diff --git a/cvtkanji.c b/cvtkanji.c
index d015c58..5452215 100644
--- a/cvtkanji.c
+++ b/cvtkanji.c
@@ -31,9 +31,10 @@
 #include "sj_kcnv.h"
 #include "kanakan.h"
 
-void mkknjmax();
-void mvmemi(), free_clall();
-void free_jall();
+void mkknjmax(void);
+void mvmemi(unsigned char * src, unsigned char * dest, int len);
+void free_clall(CLREC * p);
+void free_jall(JREC * p);
 
 void cvtphknj(void) {
 	int    i, j;
diff --git a/deldic.c b/deldic.c
index fd18956..f3b069c 100644
--- a/deldic.c
+++ b/deldic.c
@@ -32,8 +32,8 @@
 #include "sj_kcnv.h"
 #include "kanakan.h"
 
-void mvmemi();
-void mkidxtbl();
+void mvmemi(unsigned char * src, unsigned char * dest, int len);
+void mkidxtbl(DICT * dict);
 
 static int  del_douon(TypeDicSeg seg, unsigned char* ptr, TypeDicOfs ofs);
 static int  del_segment(TypeDicSeg seg);
diff --git a/edit.c b/edit.c
index 5bec0fc..9ac33a8 100644
--- a/edit.c
+++ b/edit.c
@@ -30,7 +30,7 @@
 #include "common.h"
 #include "key.h"
 
-void Chain();
+void Chain(int n, int len);
 
 static wchar16_t* jpoint;
 static int	  iedit, jedit;
diff --git a/etc.c b/etc.c
index eb5b699..0048699 100644
--- a/etc.c
+++ b/etc.c
@@ -35,7 +35,7 @@ static char  rehname[SHORTLENGTH * 2];
 extern char* cur_serv;
 static int   dcflag = 0;
 
-void disp_version();
+void disp_version(int c);
 int exec_etc(int key)
 {
 	unsigned short row, col;
diff --git a/eucmessage.c b/eucmessage.c
index 8a6ccf0..995ce26 100644
--- a/eucmessage.c
+++ b/eucmessage.c
@@ -342,12 +342,26 @@ int init_hin_val(void)
 	hin_val[4].ivalue  = SJ3_H_SILVERB;
 }
 
-extern int set_func(), set_etckeys(), set_intr(),
-    set_delkey(), set_goto(), set_trap(), set_init_mode(),
-    set_helpmenu(), set_defcode(), set_muhenkan(), set_muedit(),
-    set_m_toggle(), set_guide(), set_forkshell(), set_bstudy(),
-    set_silent(), set_flush_conversion(), set_rkebell(), set_server(),
-    set_dict();
+extern int  set_func(struct wordent word[]);
+extern int  set_etckeys(struct wordent word[]);
+extern int  set_intr(struct wordent word[]);
+extern int  set_delkey(struct wordent word[]);
+extern int  set_goto(struct wordent word[]);
+extern int  set_trap(struct wordent word[]);
+extern int  set_init_mode(struct wordent word[]);
+extern int  set_helpmenu(struct wordent word[]);
+extern int  set_defcode(struct wordent word[]);
+extern int  set_muhenkan(struct wordent word[]);
+extern int  set_muedit(struct wordent word[]);
+extern int  set_m_toggle(struct wordent word[]);
+extern int  set_guide(struct wordent word[]);
+extern int  set_forkshell(struct wordent word[]);
+extern int  set_bstudy(struct wordent word[]);
+extern int  set_silent(struct wordent word[]);
+extern int  set_flush_conversion(struct wordent word[]);
+extern int  set_rkebell(struct wordent word[]);
+extern int  set_server(struct wordent word[]);
+extern int  set_dict(struct wordent word[]);
 #define CURFUNCS 29
 struct functbl funcs[CURFUNCS];
 int init_funcs(void)
diff --git a/execute.c b/execute.c
index e4706af..77f47ce 100644
--- a/execute.c
+++ b/execute.c
@@ -71,12 +71,13 @@ static Client*	 cur_cli;
 static unsigned char defaultchar[2] = {(unsigned char)0x81, (unsigned char)0x40};
 static int	     defuse = 0, defuse2 = 0;
 
-DictFile* opendict();
-int	  closedict();
-StdyFile* openstdy();
-int	  closestdy();
+DictFile* opendict(char* name, char* passwd);
+int	  closedict(DictFile* dfp);
+StdyFile* openstdy(char* name, char* passwd);
+int	  closestdy(StdyFile* sfp);
 
-unsigned char *put_ndata(), *put_string();
+unsigned char* put_ndata(unsigned char* p, int n);
+unsigned char* put_string(unsigned char* p);
 
 int make_full_path(char* path) {
 	char  tmp[PathNameLen];
diff --git a/funckey.c b/funckey.c
index 273384f..ffde33a 100644
--- a/funckey.c
+++ b/funckey.c
@@ -169,13 +169,13 @@ void clear_ukeys(void) {
 	Unumber = 0;
 }
 
-void set_func(struct wordent word[]) {
+int set_func(struct wordent word[]) {
 	int		i, num;
 	wchar16_t *	p, *s;
 	struct wcvtkey* ckeyp;
 
 	if(Unumber >= UKEYNUM)
-		return;
+		return 0;
 	for(i = 0; i < KEY_OTHER && *comstr[i] != '\0'; i++) {
 		if(match(word[1].word_str, comstr[i])) {
 			p = word[2].word_str;
@@ -185,7 +185,7 @@ void set_func(struct wordent word[]) {
 					if(wscmp(p, ckeyp->key_word) == 0) {
 						p = ckeyp->key_seq;
 						if(*p == '\0')
-							return;
+							return 0;
 						break;
 					}
 					ckeyp++;
@@ -201,9 +201,10 @@ void set_func(struct wordent word[]) {
 					comvalue[comnumber++] = comstrvalue[i];
 				}
 			}
-			return;
+			return 0;
 		}
 	}
+	return 0;
 }
 
 wchar16_t
diff --git a/fuzoku.c b/fuzoku.c
index ab2f0cb..c6ea47c 100644
--- a/fuzoku.c
+++ b/fuzoku.c
@@ -32,8 +32,8 @@
 #include "sj_right.h"
 #include "sj_yomi.h"
 
-CLREC* argclrec();
-int    terminate();
+CLREC* argclrec(int len);
+int terminate(TypeCnct right, unsigned char * yomi);
 static int fzkstrcmp(unsigned char * yptr, unsigned char * fzkp, int * saml)
 {
 	int asklen, nkrlen;
diff --git a/henkan.c b/henkan.c
index aac2969..ab4412e 100644
--- a/henkan.c
+++ b/henkan.c
@@ -32,7 +32,7 @@
 #include "wchar16.h"
 #include "kctype.h"
 
-void Rdisp();
+void Rdisp(void);
 
 int i_point;
 int exec_henkan(void)
diff --git a/kigou.c b/kigou.c
index f1d4c60..2afd39c 100644
--- a/kigou.c
+++ b/kigou.c
@@ -39,13 +39,15 @@ static int lastcode = BEGIN_CODE;
 
 static unsigned short row, col;
 
-void input_kigou();
+void input_kigou(int basecode, int code, int increse);
 int kigou(void)
 {
 	extern int     keyvalue;
 	int	       increse, code, basecode;
 	int	       inc, ki, low;
-	unsigned short num, CheckCcode(), strtocode();
+	unsigned short num;
+	unsigned short CheckCcode(wchar16_t c);
+	unsigned short strtocode(void);
 	int	       rval;
 
 	increse = INCRESE;
diff --git a/level1.c b/level1.c
index b149476..72ceb7e 100644
--- a/level1.c
+++ b/level1.c
@@ -136,12 +136,12 @@ put_ndata(void* p, int n) {
 
 static int
 put_over(int buflen, int		  n,
-	 unsigned char* (*func1)(), void* str1, int len1,
-	 unsigned char* (*func2)(), void* str2, int len2,
-	 unsigned char* (*func3)(), void* str3, int len3,
-	 unsigned char* (*func4)(), void* str4, int len4) {
+	 unsigned char* (*func1)(void*, int), void* str1, int len1,
+	 unsigned char* (*func2)(void*, int), void* str2, int len2,
+	 unsigned char* (*func3)(void*, int), void* str3, int len3,
+	 unsigned char* (*func4)(void*, int), void* str4, int len4) {
 #define ARGNUM 4
-	unsigned char* (*func[ARGNUM])();
+	unsigned char* (*func[ARGNUM])(void*, int);
 	unsigned char* data[ARGNUM];
 	int	       len[ARGNUM];
 	int	       i;
diff --git a/libif.c b/libif.c
index 0fb81be..db205df 100644
--- a/libif.c
+++ b/libif.c
@@ -33,6 +33,7 @@
 #endif
 #include "wchar16.h"
 #include <locale.h>
+#include <string.h>
 #include "kctype.h"
 #include "common.h"
 
@@ -40,12 +41,13 @@ extern char   user_name[];
 extern char * cur_serv, **serv_list;
 extern char** dict_list;
 extern int    dict_num;
-char*	      chmyhname();
+char*	      chmyhname(char* hname);
 
 extern int current_locale;
-int	   sjislen(), euclen();
+int sjislen(unsigned char * str, int max);
+int euclen(unsigned char * str, int max);
 
-int (*len_func[3])() = {0, sjislen, euclen};
+int (*len_func[3])(unsigned char*, int) = {0, sjislen, euclen};
 
 #define YOMILEN 32
 #define KLEN 64
diff --git a/makelist.c b/makelist.c
index 9f22aa9..bee351a 100644
--- a/makelist.c
+++ b/makelist.c
@@ -316,7 +316,7 @@ douon_knj(DouonRec* drec) {
 	int	       i;
 	int	       len = 0;
 	unsigned char* p;
-	unsigned char* knjofscvt();
+	unsigned char* knjofscvt(unsigned char* ptr, int len, int* ret);
 	HinsiRec*      hrec;
 	KanjiRec*      krec;
 
diff --git a/memory2.c b/memory2.c
index 093e030..ef330b0 100644
--- a/memory2.c
+++ b/memory2.c
@@ -29,7 +29,8 @@
 
 #include "sj_kcnv.h"
 
-void free_jrec(), free_clrec();
+void free_jrec(JREC* p);
+void free_clrec(CLREC* p);
 JREC* free_jlst(JREC * p)
 {
 	JREC* jpk;
diff --git a/mk2claus.c b/mk2claus.c
index 70208ad..e4f715e 100644
--- a/mk2claus.c
+++ b/mk2claus.c
@@ -30,9 +30,14 @@
 #include "sj_kcnv.h"
 #include "sj_right.h"
 
-int  terminate(), priority();
-void mkjiritu(), mkbunsetu(), wakachi(), pritiny();
-void free_clall(), free_jall();
+int terminate(TypeCnct right, unsigned char * yomi);
+int priority(CLREC * clrec);
+void mkjiritu(int mode);
+void mkbunsetu(void);
+void wakachi(void);
+void pritiny(void);
+void free_clall(CLREC * p);
+void free_jall(JREC * p);
 static int set2nd(CLREC * clrec)
 {
 
diff --git a/mkbunset.c b/mkbunset.c
index 05dbc0f..6e01924 100644
--- a/mkbunset.c
+++ b/mkbunset.c
@@ -33,8 +33,9 @@
 #include "sj_hinsi.h"
 #include "kanakan.h"
 
-int  terminate();
-void setclrec(), srchfzk();
+int terminate(TypeCnct right, unsigned char * yomi);
+void setclrec(JREC * jrec, unsigned char * yptr, TypeCnct right);
+void srchfzk(JREC * jrec, unsigned char * yptr, TypeCnct right, int level);
 
 void mkbunsetu(void) {
 	JREC*	       jrec;
diff --git a/mkjiritu.c b/mkjiritu.c
index d322fb9..a7c006e 100644
--- a/mkjiritu.c
+++ b/mkjiritu.c
@@ -32,7 +32,7 @@
 #include "sj_kcnv.h"
 #include "kanakan.h"
 
-int srchhead();
+int srchhead(void);
 
 static void dic_mu(int mode);
 static void dic_cl(void);
diff --git a/nmttyslot.c b/nmttyslot.c
index cae5dc2..556acbc 100644
--- a/nmttyslot.c
+++ b/nmttyslot.c
@@ -33,7 +33,7 @@
 #include <string.h>
 #include <unistd.h>
 
-static char* getttys();
+static char* getttys(int f);
 static char* ttys = "/etc/ttys";
 
 #define NULL 0
diff --git a/peepdic.c b/peepdic.c
index 45f1099..406b4bc 100644
--- a/peepdic.c
+++ b/peepdic.c
@@ -31,7 +31,7 @@
 #include "sj_yomi.h"
 #include "kanakan.h"
 
-unsigned char* skiphblk();
+unsigned char* skiphblk(unsigned char * ptr);
 
 static void add_yomi(void);
 static void cd2sjh_chr(unsigned char ch, unsigned char* dst);
diff --git a/ph2knj.c b/ph2knj.c
index 4ba9353..7f948f6 100644
--- a/ph2knj.c
+++ b/ph2knj.c
@@ -32,12 +32,12 @@
 #include "sj_yomi.h"
 #include "kanakan.h"
 
-int    sj2cd_chr();
-void   mk2claus();
-void   freework();
-void   selclrec();
-CLREC* free_clst();
-JREC*  free_jlst();
+int sj2cd_chr(unsigned char * euc, unsigned char * yomi);
+void mk2claus(void);
+void freework(void);
+void selclrec(void);
+CLREC* free_clst(CLREC * p, int l);
+JREC* free_jlst(JREC * p);
 
 int ph2knj(unsigned char* zyomi, unsigned char* kanji, int knjlen) {
 	unsigned char* ptr;
diff --git a/rk_conv.c b/rk_conv.c
index 6b8a646..b9a583a 100644
--- a/rk_conv.c
+++ b/rk_conv.c
@@ -35,9 +35,8 @@ static char rcsid[] = "$Header: /export/work/contrib/sj3/sj3rkcv/RCS/rk_conv.c,v
 #include "wchar16.h"
 #include <stdio.h>
 #include <ctype.h>
-#ifdef SVR4
 #include <string.h>
-#else
+#ifndef SVR4
 #include <strings.h>
 #endif
 #ifdef __sony_news
@@ -454,16 +453,18 @@ int sj3_rkinit_mb(char * rkfile)
 		return sj3_rkinit_sub(rkfile, rcode_sjis_init);
 }
 
-int sj3_rkinit_sub(char* rkfile, int (*mbfunc)())
+int sj3_rkinit_sub(char* rkfile, int (*mbfunc)(void))
 {
 	char*	       p;
 	int	       len, klen, rlen, retv;
-	FILE *	       fp, *fopen();
+	FILE*	       fp;
 	char	       line[MAXLEN + 1];
 	wchar16_t      rkey[MAXWLEN + 1], rstr[MAXWLEN + 1];
 	unsigned short kstr[MAXWLEN + 1];
-	char *	       strcpy(), *getkey(), *rkgetyomi();
-	RkTablW16 *    rktp, *mktable();
+	char* getkey(char * istr, wchar16_t * ostr, int * len);
+	char* rkgetyomi(char * istr, wchar16_t * ostr, int * len);
+	RkTablW16 *    rktp;
+	RkTablW16* mktable(wchar16_t * key, int len);
 
 	if(rkfile == NULL || *rkfile == NSTR)
 		fp = stdin;
diff --git a/selclrec.c b/selclrec.c
index fc0150b..a5ec7fd 100644
--- a/selclrec.c
+++ b/selclrec.c
@@ -29,8 +29,11 @@
 
 #include "sj_kcnv.h"
 
-void free_clall(), free_jall(), mkjiritu(), mkbunsetu();
-void wakachi();
+void mkjiritu(int mode);
+void mkbunsetu(void);
+void free_clall(CLREC * p);
+void free_jall(JREC * p);
+void wakachi(void);
 void selclrec(void)
 {
 	int    len;
diff --git a/server.h b/server.h
index 0528ea6..572fc1b 100644
--- a/server.h
+++ b/server.h
@@ -66,10 +66,10 @@ void warning_out(char *s, int p1, int p2, int p3, int p4, int p5);
 void logging_out(char *s, int p1, int p2, int p3, int p4, int p5);
 void debug_out(int lvl, char *s, int p1, int p2, int p3, int p4, int p5);
 #else /* correct solution is to make the functions take arbitrary parameters... */
-void error_out();
-void warning_out();
-void logging_out();
-void debug_out();
+void error_out(char * fmt, int p1, int p2, int p3, int p4, int p5);
+void warning_out(char* s, int p1, int p2, int p3, int p4, int p5);
+void logging_out(char* s, int p1, int p2, int p3, int p4, int p5);
+void debug_out(int lvl, char* s, int p1, int p2, int p3, int p4, int p5);
 #endif
 
 /* execute.c */
diff --git a/setup.c b/setup.c
index 9051bf5..e2bffe4 100644
--- a/setup.c
+++ b/setup.c
@@ -193,7 +193,7 @@ get_list(unsigned char* p, StrList** dst) {
 
 struct optlist {
 	char* optname;
-	unsigned char* (*optfunc)();
+	unsigned char* (*optfunc)(unsigned char* p, void* pv_dst);
 	void* optarg;
 } option[] = {
     /*
diff --git a/sj3.c b/sj3.c
index 0fc74fc..78097ca 100644
--- a/sj3.c
+++ b/sj3.c
@@ -31,6 +31,8 @@
 #include "wchar16.h"
 #include <signal.h>
 #include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
 #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__bsdi__) || defined(__DragonFly__)
 #define USE_OLD_TTY
 #if defined(__NetBSD__)
@@ -128,9 +130,9 @@ struct jtchars jtc;
 int	  erase_char;
 wchar16_t erase_str[2];
 #ifdef SIGTYPE_VOID
-void (*sigpipe)();
+void (*sigpipe)(int);
 #else
-int (*sigpipe)();
+int (*sigpipe)(int);
 #endif
 
 int Pid_shell;
@@ -192,8 +194,7 @@ void init(char** argv) {
 void init_env(void) {
 	char *	       uname, *hp, *tname;
 	int	       i;
-	struct passwd *pwd, *getpwnam(), *getpwuid();
-	char *	       getlogin(), *getenv();
+	struct passwd* pwd;
 
 	user_name[0] = '\0';
 	home[0]	     = '\0';
@@ -880,7 +881,6 @@ void getslave(void) {
 
 void execcmd(char* cmd, char** ap) {
 	int   c;
-	char* getenv();
 	char *path, *cp, fullcmd[BUFSIZ];
 
 	path = getenv("PATH");
@@ -980,9 +980,9 @@ void exitprocess(void) {
 
 void suspend(void) {
 #ifdef SIGTYPE_VOID
-	void (*old_sigtstp)();
+	void (*old_sigtstp)(int);
 #else
-	int (*old_sigtstp)();
+	int (*old_sigtstp)(int);
 #endif
 	SELECT_FD      ifds;
 	int	       nc;
diff --git a/sj3.h b/sj3.h
index 1491719..3808d32 100644
--- a/sj3.h
+++ b/sj3.h
@@ -38,7 +38,7 @@
 void	  mk_cvtkey(char* term);
 char*	  getkey2(char* istr, char* ostr);
 void	  clear_ukeys(void);
-void	  set_func(struct wordent word[]);
+int	  set_func(struct wordent word[]);
 wchar16_t eval_keys(wchar16_t* s, wchar16_t* p);
 void	  clear_key(void);
 void	  clear_commkeys(void);
diff --git a/sj3_rkcv.c b/sj3_rkcv.c
index 7f30bf4..0128843 100644
--- a/sj3_rkcv.c
+++ b/sj3_rkcv.c
@@ -154,13 +154,15 @@ static unsigned short HZtbl[95] = {
     0xa3f0, 0xa3f1, 0xa3f2, 0xa3f3, 0xa3f4, 0xa3f5, 0xa3f6, 0xa3f7,
     0xa3f8, 0xa3f9, 0xa3fa, 0xa1d0, 0xa1c3, 0xa1d1, 0xa1b1};
 
-#ifdef ADDHK setl_hktozh(void)
+#ifdef ADDHK
+int setl_hktozh(void)
 {
 	int	       i;
 	unsigned short c, zen1;
 	wchar16_t      rstr[2];
 	wchar16_t      kstr[2];
-	RkTablW16 *    rktp, *mktable();
+	RkTablW16 *    rktp;
+	RkTablW16* mktable(wchar16_t * key, int len);
 
 	zen1	= (ZHIRA1 << 8);
 	rstr[1] = '\0';
@@ -195,7 +197,8 @@ int mkkigou(void)
 	int	   i;
 	wchar16_t  rstr[2];
 	wchar16_t  kstr[2];
-	RkTablW16 *rktp, *mktable();
+	RkTablW16 *rktp;
+	RkTablW16* mktable(wchar16_t * key, int len);
 
 	rstr[1] = '\0';
 	kstr[1] = 0;
diff --git a/sjrc.c b/sjrc.c
index 30e878d..f817960 100644
--- a/sjrc.c
+++ b/sjrc.c
@@ -49,12 +49,13 @@ static char* rcfile = ".sjrc";
 static int user_euc  = 0;
 static int file_code = SYS_SJIS;
 
-void setrc();
-int  set_dict(), set_server();
+int setrc(char * file);
+int set_dict(struct wordent word[]);
+int set_server(struct wordent word[]);
 
 struct functbl {
 	char* keyword;
-	int (*func)();
+	int (*func)(struct wordent word[]);
 } funcs[] = {
     {"dictionary", set_dict},
     {"userdic", set_dict},
diff --git a/sjrc2.c b/sjrc2.c
index 379e33b..f8af73e 100644
--- a/sjrc2.c
+++ b/sjrc2.c
@@ -35,6 +35,8 @@
 #include "common.h"
 #include "key.h"
 #include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include "Paths.h"
 
 int	   vflag = 1;
@@ -99,12 +101,26 @@ extern wchar16_t *Key, *Escape, *Sjxkey, *Etckey, *Intr, *Bskey, *Delkey,
 extern wchar16_t *Halpha, *Zalpha, *Hkata, *Zkata, *Hira;
 extern wchar16_t *Shiftjis, *Sjis, *Euc, *Euc2, *Jis, *Jis2, *Kuten, *Kuten2;
 
-int set_func(), set_etckeys(), set_intr(),
-    set_delkey(), set_goto(), set_trap(), set_init_mode(),
-    set_helpmenu(), set_defcode(), set_muhenkan(), set_muedit(),
-    set_m_toggle(), set_guide(), set_forkshell(), set_bstudy(),
-    set_silent(), set_flush_conversion(), set_rkebell(), set_server(),
-    set_dicts();
+int  set_func(struct wordent word[]);
+int  set_etckeys(struct wordent word[]);
+int  set_intr(struct wordent word[]);
+int  set_delkey(struct wordent word[]);
+int  set_goto(struct wordent word[]);
+int  set_trap(struct wordent word[]);
+int  set_init_mode(struct wordent word[]);
+int  set_helpmenu(struct wordent word[]);
+int  set_defcode(struct wordent word[]);
+int  set_muhenkan(struct wordent word[]);
+int  set_muedit(struct wordent word[]);
+int  set_m_toggle(struct wordent word[]);
+int  set_guide(struct wordent word[]);
+int  set_forkshell(struct wordent word[]);
+int  set_bstudy(struct wordent word[]);
+int  set_silent(struct wordent word[]);
+int  set_flush_conversion(struct wordent word[]);
+int  set_rkebell(struct wordent word[]);
+int  set_server(struct wordent word[]);
+int  set_dicts(void);
 
 extern struct functbl funcs[];
 extern struct valtbl  mode_val[], code_val[];
@@ -143,7 +159,6 @@ int sjrc_init(void)
 int getsjrc(void)
 {
 	char* p;
-	char* getenv();
 
 	sjset_code();
 	mk_cvtkey(term_name);
@@ -176,7 +191,7 @@ int setrc(char * file)
 	char		line[MAXLINE];
 	struct wordent	word[WORDN];
 	struct functbl* functp;
-	FILE *		fd, *fopen();
+	FILE*		fd;
 
 	if(vflag > 1)
 		aprintf("sjrc file is %s\n", file);
@@ -205,7 +220,6 @@ int getsjrk(int erase)
 {
 	char* p;
 	int   i;
-	char* getenv();
 	char  RKfile[LONGLENGTH];
 
 	RKfile[0] = '\0';
diff --git a/skiphblk.c b/skiphblk.c
index 1fd0769..9a9b861 100644
--- a/skiphblk.c
+++ b/skiphblk.c
@@ -31,7 +31,7 @@
 #include "sj_typedef.h"
 #include "sj_dict.h"
 
-unsigned char* skipkstr();
+unsigned char* skipkstr(unsigned char* ptr);
 unsigned char* skiphblk(unsigned char * ptr)
 {
 	ptr++;
diff --git a/srchidx.c b/srchidx.c
index d46ad37..02fca60 100644
--- a/srchidx.c
+++ b/srchidx.c
@@ -32,7 +32,7 @@
 #include "sj_kcnv.h"
 #include "kanakan.h"
 
-int istrcmp();
+int istrcmp(unsigned char* yomip, unsigned char* idxp, int ylen, int ilen);
 
 TypeDicSeg
 srchidx(TypeDicSeg low, int len) {
diff --git a/study.c b/study.c
index 710006f..becb31f 100644
--- a/study.c
+++ b/study.c
@@ -31,7 +31,8 @@
 #include "sj_kcnv.h"
 #include "kanakan.h"
 
-void mvmemi(), mvmemd();
+void mvmemi(unsigned char * src, unsigned char * dest, int len);
+void mvmemd(unsigned char * src, unsigned char * dest, int len);
 
 int study(STDYOUT* stdy) {
 	STDYOUT	   outp;
diff --git a/wakachi.c b/wakachi.c
index 7b04e9e..dee9a36 100644
--- a/wakachi.c
+++ b/wakachi.c
@@ -32,8 +32,9 @@
 #include "sj_hinsi.h"
 #include "kanakan.h"
 
-int  terminate();
-void setclrec(), srchfzk();
+int terminate(TypeCnct right, unsigned char * yomi);
+void setclrec(JREC * jrec, unsigned char * yptr, TypeCnct right);
+void srchfzk(JREC * jrec, unsigned char * yptr, TypeCnct right, int level);
 
 void wakachi(void) {
 	JREC*  jrec;
diff --git a/wchar16.h b/wchar16.h
index 45545e5..7e4ac40 100644
--- a/wchar16.h
+++ b/wchar16.h
@@ -344,6 +344,8 @@ typedef unsigned short wchar16_t;
 
 extern wchar16_t* WcMessages[];
 
+struct wordent;
+
 struct wcvtkey {
 	wchar16_t* key_word;
 	wchar16_t  key_seq[SEQLEN];
@@ -351,7 +353,7 @@ struct wcvtkey {
 
 struct functbl {
 	wchar16_t* keyword;
-	int (*func)();
+	int (*func)(struct wordent* word);
 };
 
 #endif