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diff --git a/test/testutils/comparators.h b/test/testutils/comparators.h
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+/*
+ * This file is part of libdom test suite.
+ * Licensed under the MIT License,
+ * http://www.opensource.org/licenses/mit-license.php
+ * Copyright 2007 James Shaw <jshaw@netsurf-browser.org>
+ * Copyright 2009 Bo Yang <struggleyb.nku@gmail.com>
+ */
+
+#ifndef comparators_h_
+#define comparators_h_
+
+/**
+ * A function pointer type for a comparator.
+ */
+typedef int (*comparator)(const void* a, const void* b);
+
+int int_comparator(const void* a, const void* b);
+
+int str_icmp(const void *a, const void *b);
+int str_icmp_r(const void *a, const void *b);
+int str_cmp(const void *a, const void *b);
+int str_cmp_r(const void *a, const void *b);
+#endif