From bca05c8d6734f179d52e7cc16cebe40f532c2742 Mon Sep 17 00:00:00 2001
From: Jane Tournois <jane.tournois@gmail.com>
Date: Fri, 24 Sep 2021 11:14:01 +0200
Subject: [PATCH] add header inclusion protection

---
 STL_Extension/include/CGAL/assertions_impl.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/STL_Extension/include/CGAL/assertions_impl.h b/STL_Extension/include/CGAL/assertions_impl.h
index cfe4a27cf00..8701e67ccf7 100644
--- a/STL_Extension/include/CGAL/assertions_impl.h
+++ b/STL_Extension/include/CGAL/assertions_impl.h
@@ -14,6 +14,9 @@
 //
 // Author(s)     : Geert-Jan Giezeman and Sven Schönherr
 
+#ifndef CGAL_ASSERTIONS_IMPL_H
+#define CGAL_ASSERTIONS_IMPL_H
+
 #ifdef CGAL_HEADER_ONLY
 #define CGAL_INLINE_FUNCTION inline
 #else
@@ -280,3 +283,5 @@ set_warning_behaviour(Failure_behaviour eb)
 }
 
 } //namespace CGAL
+
+#endif //CGAL_ASSERTIONS_IMPL_H