https://tug.org/pipermail/tex-live/2024-November/050931.html
https://bugs.gentoo.org/944178
--- a/dvi-draw.c
+++ b/dvi-draw.c
@@ -198,7 +198,6 @@ bmUnitT bit_masks[] = {
 #ifdef	VMS
 #define	off_t	int
 #endif
-extern off_t lseek();
 
 #ifndef	SEEK_SET	/* if <unistd.h> is not provided (or for <X11R5) */
 #define	SEEK_SET	0
@@ -4693,8 +4692,6 @@ anchor_search(const char *str)
 
 #if GREY
 
-extern	double	pow();
-
 static void
 mask_shifts(Pixel mask, int *pshift1, int *pshift2)
 {
--- a/gui/menu.c
+++ b/gui/menu.c
@@ -62,7 +62,7 @@ static struct button_info *m_button_info = NULL; /* toplevel node of pulldown me
 
 
 static void
-set_menu_info(void *val, XtActionProc proc, Boolean (*cmp)(), struct button_info *item)
+set_menu_info(void *val, XtActionProc proc, Boolean (*cmp)(void *, const char *), struct button_info *item)
 {
     size_t i;
     ASSERT(item != NULL, "item in set_menu_info musn't be NULL!");
@@ -96,7 +96,7 @@ set_menu_info(void *val, XtActionProc proc, Boolean (*cmp)(), struct button_info
 
 /* set a menu according to val and the compare function cmp */
 void
-set_menu(void *val, XtActionProc proc, Boolean (*cmp)())
+set_menu(void *val, XtActionProc proc, Boolean (*cmp)(void *, const char *))
 {
     /* removed following since cast from function pointer to void pointer is not supported by ANSI C */
     /* TRACE_GUI((stderr, "set_menu_info: %d, %p, %p", *(int *)val, (void *)proc, (void *)cmp)); */
--- a/gui/menu.h
+++ b/gui/menu.h
@@ -67,6 +67,6 @@ extern void create_menu_buttons(Widget parent,
 #endif
 				);
 
-extern void set_menu(void *val, XtActionProc proc, Boolean (*cmp)());
+extern void set_menu(void *val, XtActionProc proc, Boolean (*cmp)(void *, const char *));
 
 #endif /* MENU_H_ */
--- a/gui/sfDraw.c
+++ b/gui/sfDraw.c
@@ -238,7 +238,6 @@ SFstatAndCheck(SFDir *dir, SFEntry *entry)
     struct stat statBuf;
     char save;
     int last;
-    extern int SFchdir();
 
     /*
      * must be restored before returning
--- a/gui/sfDraw.h
+++ b/gui/sfDraw.h
@@ -56,7 +56,7 @@ void SFhAreaSelectedCallback(Widget w, int n, int pnew);
 void SFpathSliderMovedCallback(Widget w, XtPointer client_data, float *new);
 void SFpathAreaSelectedCallback(Widget w, XtPointer client_data, int pnew);
 Boolean SFworkProc(void);
-extern int (*SFfunc)();
+extern int (*SFfunc)(char *entryReal, char **entryShown, struct stat *statBuf);
 
 extern Widget selFileField, selFileForm, selFileHScroll, selFileHScrolls[], selFileLists[], selFileVScrolls[];
 extern Display *SFdisplay;
--- a/gui/sfSelFile.c
+++ b/gui/sfSelFile.c
@@ -125,7 +125,7 @@ XtAppContext SFapp;
 int SFpathScrollWidth, SFvScrollHeight, SFhScrollWidth;
 char SFtextBuffer[MAXPATHLEN];
 XtIntervalId SFdirModTimerId;
-int (*SFfunc) ();
+int (*SFfunc) (char *entryReal, char **entryShown, struct stat *statBuf);
 
 static int SFstatus = SEL_FILE_NULL;