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diff --git a/extra/mariabackup/crc/crc-intel-pclmul.h b/extra/mariabackup/crc/crc-intel-pclmul.h
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+/******************************************************
+Copyright (c) 2017 Percona LLC and/or its affiliates.
+
+CRC32 using Intel's PCLMUL instruction.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; version 2 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+
+*******************************************************/
+
+#include <stdint.h>
+#include <stddef.h>
+
+void
+crc32_intel_pclmul(uint32_t *pcrc, const uint8_t *inbuf, size_t inlen);