-#ifndef GINAC_GCD_EUCLID
-#define GINAC_GCD_EUCLID
+/** @file gcd_euclid.h
+ *
+ * GCD using Euclidean algorithm. */
+
+/*
+ * GiNaC Copyright (C) 1999-2019 Johannes Gutenberg University Mainz, Germany
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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
+ */
+
+#ifndef GINAC_GCD_EUCLID_H
+#define GINAC_GCD_EUCLID_H
+
#include "upoly.h"
#include "remainder.h"
#include "normalize.h"
#include "debug.h"
#include "upoly_io.h"
-namespace GiNaC
-{
+namespace GiNaC {
static bool
gcd_euclid(umodpoly& c, umodpoly /* passed by value */ a, umodpoly b)
} // namespace GiNaC
-#endif // GINAC_GCD_EUCLID
-
+#endif // ndef GINAC_GCD_EUCLID_H