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diff --git a/book.c b/book.c
index 89ac610..dc81458 100644
--- a/book.c
+++ b/book.c
@@ -28,6 +28,8 @@
  * ------------------------------------------------------------------------
  */
 
+#include "config.h"
+
 #include <stdio.h>
 #include <string.h>
 #include <time.h>