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/usr/include/re/re_crc32.h is in libre-dev 0.4.14-4.

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/**
 * @file re_crc32.h  Interface to CRC-32 functions
 *
 * Copyright (C) 2010 Creytiv.com
 */


#ifdef USE_ZLIB
#include <zlib.h>
#else
uint32_t crc32(uint32_t crc, const void *buf, uint32_t size);
#endif