--- bip-0.8.8/src/lex.l.orig
+++ bip-0.8.8/src/lex.l
@@ -16,7 +16,7 @@
 int linec;
 #include "util.h"
 extern list_t *root_list;
-void yyparse(void);
+int yyparse(void);
 void free_conf(list_t*);
 int conf_error;
 typedef struct bip bip_t;