1 files changed, 6 insertions, 1 deletions
diff --git a/grammar.y b/grammar.y
index fd9da47..446b651 100644
--- a/grammar.y
+++ b/grammar.y
@@ -1,5 +1,9 @@
 %{
 #include <stdio.h>
+
+extern FILE *yyin;
+extern int yylex();
+extern void yyerror();
 %}
 
 %define parse.error verbose
@@ -46,8 +50,9 @@ expression:   NUMBER
             ;
 %%
 
-main (int argc, char **argv)
+void main (int argc, char **argv)
 {
   //henshin_lex();
+  yyin = fopen(argv[1], "r");
   yyparse();
 }