build fix

diff --git a/src/lexer.in.cc b/src/lexer.in.cc
index a3b29c1..1df1f06 100644 (file)
--- a/src/lexer.in.cc
+++ b/src/lexer.in.cc
@@ -14,6 +14,8 @@
 
 #include "lexer.h"
 
+#include <stdio.h>
+
 #include "eval_env.h"
 
 bool Lexer::Error(const string& message, string* err) {