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diff --git a/lib/expr/expr.h b/lib/expr/expr.h
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index 3d7fbd6..d6cfb53 100644
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--- a/lib/expr/expr.h
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+++ b/lib/expr/expr.h
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@@ -36,6 +36,7 @@ extern "C" {
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#include <stddef.h>
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#include <stdio.h>
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#include <vmalloc/vmalloc.h>
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+#include <wchar.h>
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#define EX_VERSION 20000101L
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