cksum: make cksum.h standalone

* src/cksum.h: Include stdint.h, stdio.h so that this file
can be included in any order, after config.h.
Add a copyright notice.

1 files changed, 20 insertions, 1 deletions

diff --git a/src/cksum.h b/src/cksum.h
index c42491a95..d866a7b74 100644
--- a/src/cksum.h
+++ b/src/cksum.h
@@ -1,5 +1,24 @@
+/* Calculate checksums and sizes of files
+   Copyright 2025 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/>.  */
+
 #ifndef __CKSUM_H__
-# define __CKSUM_H__
+#define __CKSUM_H__
+
+#include <stdint.h>
+#include <stdio.h>
 
 extern bool cksum_debug;