diff --git a/edef.h b/edef.h
index 8b5c771..3a3939b 100644
--- a/edef.h
+++ b/edef.h
@@ -491,3 +491,11 @@ extern int copyregion(int f, int n);
 extern int lowerregion(int f, int n);
 extern int upperregion(int f, int n);
 extern int getregion(REGION *rp);
+
+/* posix.c */
+extern void ttopen(void);
+extern void ttclose(void);
+extern int ttputc(int c);
+extern void ttflush(void);
+extern int ttgetc(void);
+extern int typahead(void);
diff --git a/estruct.h b/estruct.h
index 19451c7..199725e 100644
--- a/estruct.h
+++ b/estruct.h
@@ -554,25 +554,25 @@ typedef struct {
 	short t_margin;		/* min margin for extended lines */
 	short t_scrsiz;		/* size of scroll region "      */
 	int t_pause;		/* # times thru update to pause */
-	int (*t_open) ();	/* Open terminal at the start.  */
-	int (*t_close) ();	/* Close terminal at end.       */
-	int (*t_kopen) ();	/* Open keyboard                */
-	int (*t_kclose) ();	/* close keyboard               */
-	int (*t_getchar) ();	/* Get character from keyboard. */
-	int (*t_putchar) ();	/* Put character to display.    */
-	int (*t_flush) ();	/* Flush output buffers.        */
-	int (*t_move) ();	/* Move the cursor, origin 0.   */
-	int (*t_eeol) ();	/* Erase to end of line.        */
-	int (*t_eeop) ();	/* Erase to end of page.        */
-	int (*t_beep) ();	/* Beep.                        */
-	int (*t_rev) ();	/* set reverse video state      */
-	int (*t_rez) ();	/* change screen resolution     */
+	void (*t_open)(void);	/* Open terminal at the start.  */
+	void (*t_close)(void);	/* Close terminal at end.       */
+	void (*t_kopen)(void);	/* Open keyboard                */
+	void (*t_kclose)(void);	/* close keyboard               */
+	int (*t_getchar)(void);	/* Get character from keyboard. */
+	int (*t_putchar)(int);	/* Put character to display.    */
+	void (*t_flush) (void);	/* Flush output buffers.        */
+	void (*t_move)(int, int);/* Move the cursor, origin 0.   */
+	void (*t_eeol)(void);	/* Erase to end of line.        */
+	void (*t_eeop)(void);	/* Erase to end of page.        */
+	void (*t_beep)(void);	/* Beep.                        */
+	void (*t_rev)(int);	/* set reverse video state      */
+	int (*t_rez)(char *);	/* change screen resolution     */
 #if	COLOR
 	int (*t_setfor) ();	/* set forground color          */
 	int (*t_setback) ();	/* set background color         */
 #endif
 #if     SCROLLCODE
-	int (*t_scroll) ();	/* scroll a region of the screen */
+	void (*t_scroll)(int, int,int);	/* scroll a region of the screen */
 #endif
 } TERM;
 
diff --git a/posix.c b/posix.c
index c5309fb..2d4f63f 100644
--- a/posix.c
+++ b/posix.c
@@ -38,7 +38,7 @@ char tobuf[TBUFSIZ];		/* terminal output buffer */
  * On VMS, it translates TT until it finds the terminal, then assigns
  * a channel to it and sets it raw. On CPM it is a no-op.
  */
-ttopen()
+void ttopen(void)
 {
 	tcgetattr(0, &otermios);	/* save old settings */
 
@@ -86,7 +86,7 @@ ttopen()
  * interpreter. On VMS it puts the terminal back in a reasonable state.
  * Another no-operation on CPM.
  */
-ttclose()
+void ttclose(void)
 {
 	tcsetattr(0, TCSADRAIN, &otermios);	/* restore terminal settings */
 }
@@ -97,7 +97,7 @@ ttclose()
  * On CPM terminal I/O unbuffered, so we just write the byte out. Ditto on
  * MS-DOS (use the very very raw console output routine).
  */
-ttputc(c)
+int ttputc(int c)
 {
 	fputc(c, stdout);
 }
@@ -106,7 +106,7 @@ ttputc(c)
  * Flush terminal buffer. Does real work where the terminal output is buffered
  * up. A no-operation on systems where byte at a time terminal I/O is done.
  */
-ttflush()
+void ttflush(void)
 {
 /*
  * Add some terminal output success checking, sometimes an orphaned
@@ -135,7 +135,7 @@ ttflush()
  * at all. More complex in VMS that almost anyplace else, which figures. Very
  * simple on CPM, because the system can do exactly what you want.
  */
-ttgetc()
+int ttgetc(void)
 {
 	return (255 & fgetc(stdin));	/* 8BIT P.K. */
 }
@@ -144,7 +144,7 @@ ttgetc()
 		keyboard buffer
 */
 
-typahead()
+int typahead(void)
 {
 	int x;			/* holds # of pending chars */
 
diff --git a/tcap.c b/tcap.c
index 723508e..25ac5cd 100644
--- a/tcap.c
+++ b/tcap.c
@@ -14,9 +14,11 @@
 #define	termdef	1		/* don't define "term" external */
 
 #include <stdio.h>
+
 #include	"estruct.h"
 #include        "edef.h"
 
+
 #if TERMCAP
 
 #if UNIX
@@ -29,23 +31,26 @@
 #define BEL     0x07
 #define ESC     0x1B
 
-extern int ttopen();
-extern int ttgetc();
-extern int ttputc();
-extern int tgetnum();
-extern int ttflush();
-extern int ttclose();
-extern int tcapkopen();
-extern int tcapkclose();
-extern int tcapmove();
-extern int tcapeeol();
-extern int tcapeeop();
-extern int tcapbeep();
-extern int tcaprev();
-extern int tcapcres();
-extern int tcapopen();
+/* FIXME! termcap */
+extern int tgetnum(char *);
+extern char *tgetstr(char *id, char **area);
+extern int tputs(const char *str, int affcnt, int (*putc)(int));
+extern char *tgoto(const char *cap, int col, int row);
+
+static void tcapkopen(void);
+static void tcapkclose(void);
+static void tcapmove(int, int);
+static void tcapeeol(void);
+static void tcapeeop(void);
+static void tcapbeep(void);
+static void tcaprev(int);
+static int tcapcres(char *);
+static void tcapscrollregion(int top, int bot);
+static void putpad(char *str);
+
+static void tcapopen(void);
 #if	PKCODE
-extern int tcapclose();
+static void tcapclose(void);
 #endif
 extern int tput();
 extern char *tgoto();
@@ -54,8 +59,8 @@ extern int tcapfcol();
 extern int tcapbcol();
 #endif
 #if     SCROLLCODE
-extern int tcapscroll_reg();
-extern int tcapscroll_delins();
+static void tcapscroll_reg(int from, int to, int lines);
+static void tcapscroll_delins(int from, int to, int lines);
 #endif
 
 
@@ -106,10 +111,10 @@ TERM term = {
 #endif
 };
 
-tcapopen()
+static void tcapopen(void)
 {
 	char *getenv();
-	char *t, *p, *tgetstr();
+	char *t, *p;
 	char tcbuf[1024];
 	char *tv_stype;
 	char err_str[72];
@@ -216,7 +221,7 @@ tcapopen()
 
 #if	PKCODE
 
-tcapclose()
+static void tcapclose(void)
 {
 	putpad(tgoto(CM, 0, term.t_nrow));
 	putpad(TE);
@@ -225,7 +230,7 @@ tcapclose()
 }
 #endif
 
-tcapkopen()
+static void tcapkopen(void)
 {
 #if	PKCODE
 	putpad(TI);
@@ -234,30 +239,31 @@ tcapkopen()
 	strcpy(sres, "NORMAL");
 }
 
-tcapkclose()
+static void tcapkclose(void)
 {
 }
 
-tcapmove(row, col)
-register int row, col;
+static void tcapmove(int row, int col)
 {
 	putpad(tgoto(CM, col, row));
 }
 
-tcapeeol()
+static void tcapeeol(void)
 {
 	putpad(CE);
 }
 
-tcapeeop()
+static void tcapeeop(void)
 {
 	putpad(CL);
 }
 
-tcaprev(state)
-    /* change reverse video status */
-int state;			/* FALSE = normal video, TRUE = reverse video */
-
+/*
+ * change reverse video status
+ *
+ * int state;		FALSE = normal video, TRUE = reverse video
+ */
+static void tcaprev(int state)
 {
 	static int revstate = FALSE;
 	if (state) {
@@ -267,7 +273,7 @@ int state;			/* FALSE = normal video, TRUE = reverse video */
 		putpad(SE);
 }
 
-tcapcres()
+static int tcapcres(char *res)
 {				/* change screen resolution */
 	return (TRUE);
 }
@@ -275,7 +281,7 @@ tcapcres()
 #if SCROLLCODE
 
 /* move howmanylines lines starting at from to to */
-tcapscroll_reg(from, to, howmanylines)
+static void tcapscroll_reg(int from, int to, int howmanylines)
 {
 	int i;
 	if (to == from)
@@ -295,7 +301,7 @@ tcapscroll_reg(from, to, howmanylines)
 }
 
 /* move howmanylines lines starting at from to to */
-tcapscroll_delins(from, to, howmanylines)
+static void tcapscroll_delins(int from, int to, int howmanylines)
 {
 	int i;
 	if (to == from)
@@ -318,7 +324,7 @@ tcapscroll_delins(from, to, howmanylines)
 }
 
 /* cs is set up just like cm, so we use tgoto... */
-tcapscrollregion(top, bot)
+static void tcapscrollregion(int top, int bot)
 {
 	ttputc(PC);
 	putpad(tgoto(CS, bot, top));
@@ -326,44 +332,44 @@ tcapscrollregion(top, bot)
 
 #endif
 
-spal(dummy)
+void spal(int dummy)
 {				/* change palette string */
 	/*      Does nothing here       */
 }
 
 #if	COLOR
-tcapfcol()
+static void tcapfcol(void)
 {				/* no colors here, ignore this */
 }
 
-tcapbcol()
+static void tcapbcol(void)
 {				/* no colors here, ignore this */
 }
 #endif
 
-tcapbeep()
+static void tcapbeep(void)
 {
 	ttputc(BEL);
 }
 
-putpad(str)
-char *str;
+static void putpad(char *str)
 {
 	tputs(str, 1, ttputc);
 }
 
-putnpad(str, n)
-char *str;
+static void putnpad(char *str, int n)
 {
 	tputs(str, n, ttputc);
 }
 
 
 #if	FNLABEL
-fnclabel(f, n)
-    /* label a function key */
-int f, n;			/* default flag, numeric argument [unused] */
-
+/*
+ * label a function key
+ *
+ * int f, n;		default flag, numeric argument [unused]
+ */
+static int fnclabel(int f, int n)
 {
 	/* on machines with no function keys...don't bother */
 	return (TRUE);
@@ -371,7 +377,7 @@ int f, n;			/* default flag, numeric argument [unused] */
 #endif
 #else
 
-hello()
+static void hello(void)
 {
 }