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diff --git a/lib/mgetgroups.h b/lib/mgetgroups.h
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+/* Get a list of all group IDs associated with a specified user ID.
+ Copyright (C) 2007, 2009-2020 Free Software Foundation, Inc.
+
+ 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 3 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, see <https://www.gnu.org/licenses/>. */
+
+#include <sys/types.h>
+
+int mgetgroups (const char *username, gid_t gid, gid_t **groups);
+#if GNULIB_XGETGROUPS
+int xgetgroups (const char *username, gid_t gid, gid_t **groups);
+#endif