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diff --git a/src/field_gmp.h b/src/field_gmp.h
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+/**********************************************************************
+ * Copyright (c) 2013, 2014 Pieter Wuille *
+ * Distributed under the MIT software license, see the accompanying *
+ * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
+ **********************************************************************/
+
+#ifndef _SECP256K1_FIELD_REPR_
+#define _SECP256K1_FIELD_REPR_
+
+#include <gmp.h>
+
+#define FIELD_LIMBS ((256 + GMP_NUMB_BITS - 1) / GMP_NUMB_BITS)
+
+typedef struct {
+ mp_limb_t n[FIELD_LIMBS+1];
+} secp256k1_fe_t;
+
+#endif