From 609135c8df1b129fab396f83c49667f9944d7802 Mon Sep 17 00:00:00 2001
From: Hans Ulrich Niedermann <hun@n-dimensional.de>
Date: Thu, 7 Oct 2021 00:02:02 +0200
Subject: HACKING.md: Update include guard macro name

---
 HACKING.md | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'HACKING.md')

diff --git a/HACKING.md b/HACKING.md
index 04f43d997..bef15b310 100644
--- a/HACKING.md
+++ b/HACKING.md
@@ -80,14 +80,17 @@ Header Files
 Please use the following layout:
 
     /* Licence, author, etc. */
-    #ifndef __FILE_NAME_H__
-    #define __FILE_NAME_H__
+    #ifndef LIBGPHOTO2_FILE_NAME_H
+    #define LIBGPHOTO2_FILE_NAME_H
 
     #include <whatever is needed for the _header_>
 
     /* Declarations */
 
-    #endif /* __FILE_NAME_H__ */
+    #endif /* !defined(LIBGPHOTO2_FILE_NAME_H) */
+
+The include guard macro starting with the project name should avoid
+potential naming conflicts with another project's `file_name.h`.
 
 
 Camlib
-- 
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