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diff --git a/include/u8c/unimax.h b/include/u8c/unimax.h
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+/*
+ Copyright 2021 Gabriel Jensen
+
+ This file is part of u8c.
+
+ u8c is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+ u8c 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 Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License along with u8c.
+
+ If not, see <https://www.gnu.org/licenses/>.
+*/
+/* Unicode maximum */
+# if !defined(u8c_unimax)
+# include <stdint.h>
+# include <uchar.h>
+# define u8c_unimax ((char32_t)UINT32_C(0x10FFFF))
+# endif