--- ./bld/yacc/c/yacc.c.ark	2008-01-26 14:32:55.000000000 +0100
+++ ./bld/yacc/c/yacc.c	2008-01-26 14:36:50.000000000 +0100
@@ -54,7 +54,7 @@
 index_t SR_conflicts;
 index_t nstate_1_reduce;
 
-static FILE *openr(), *openw();
+static FILE *openr(char *filename), *openw(char *filename);
 static void setoptions( char *p );
 
 static int warnings;