Fixes a FTBFS bug with gcc 4.

--- a/lib/parsedate.y
+++ b/lib/parsedate.y
@@ -107,6 +107,9 @@ static time_t	yyRelSeconds;
 extern struct tm	*localtime();
 
 static void		date_error();
+
+int			date_lex(void);
+
 %}
 
 %union {
@@ -671,7 +674,7 @@ LookupWord(buff, length)
 }
 
 
-static int
+int
 date_lex()
 {
     register char	c;
