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diff --git a/lib/stdckdint.in.h b/lib/stdckdint.in.h
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+/* stdckdint.h -- checked integer arithmetic
+
+   Copyright 2022 Free Software Foundation, Inc.
+
+   This program 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 2.1 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#ifndef _GL_STDCKDINT_H
+#define _GL_STDCKDINT_H
+
+#include "intprops-internal.h"
+
+/* Store into *R the low-order bits of A + B, A - B, A * B, respectively.
+   Return 1 if the result overflows, 0 otherwise.
+   A, B, and *R can have any integer type other than char, bool, a
+   bit-precise integer type, or an enumeration type.
+
+   These are like the standard macros introduced in C23, except that
+   arguments should not have side effects.  */
+
+#define ckd_add(r, a, b) ((bool) _GL_INT_ADD_WRAPV (a, b, r))
+#define ckd_sub(r, a, b) ((bool) _GL_INT_SUBTRACT_WRAPV (a, b, r))
+#define ckd_mul(r, a, b) ((bool) _GL_INT_MULTIPLY_WRAPV (a, b, r))
+
+#endif /* _GL_STDCKDINT_H */