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diff --git a/src/include/utils/dynahash.h b/src/include/utils/dynahash.h
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+/*-------------------------------------------------------------------------
+ *
+ * dynahash.h
+ * POSTGRES dynahash.h file definitions
+ *
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ * src/include/utils/dynahash.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef DYNAHASH_H
+#define DYNAHASH_H
+
+extern int my_log2(long num);
+
+#endif /* DYNAHASH_H */