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diff --git a/tune/hgcd_appr_lehmer.c b/tune/hgcd_appr_lehmer.c
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+/* mpn/generic/hgcd_appr.c forced to use Lehmer's quadratic algorithm. */
+
+/*
+Copyright 2010, 2011 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+#undef HGCD_APPR_THRESHOLD
+#define HGCD_APPR_THRESHOLD MP_SIZE_T_MAX
+#define __gmpn_hgcd_appr mpn_hgcd_appr_lehmer
+#define __gmpn_hgcd_appr_itch mpn_hgcd_appr_lehmer_itch
+
+#include "../mpn/generic/hgcd_appr.c"