From fcbf327b16a459735bfab7811c6b4a79c1ad207d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Loriot?= <sebastien.loriot@cgal.org>
Date: Wed, 13 Mar 2024 17:12:24 +0100
Subject: [PATCH] workaround absence of <filesystem>

---
 .../Polygon_repair/repair_polygon_2_test.cpp  | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/Polygon_repair/test/Polygon_repair/repair_polygon_2_test.cpp b/Polygon_repair/test/Polygon_repair/repair_polygon_2_test.cpp
index 6b673faf639..3ca4f4225df 100644
--- a/Polygon_repair/test/Polygon_repair/repair_polygon_2_test.cpp
+++ b/Polygon_repair/test/Polygon_repair/repair_polygon_2_test.cpp
@@ -3,6 +3,19 @@
 #include <CGAL/Exact_predicates_inexact_constructions_kernel.h>
 
 #include <iostream>
+
+// work around for old compilers (Apple clang < 11 for example)
+#define HAS_FILESYSTEM 1
+#if (__has_include)
+#if !__has_include(<filesystem>)
+#undef HAS_FILESYSTEM
+#define HAS_FILESYSTEM 0
+#endif
+#endif
+
+
+#if HAS_FILESYSTEM
+
 #include <fstream>
 #include <sstream>
 #include <filesystem>
@@ -80,3 +93,13 @@ int main() {
 
   return 0;
 }
+
+#else
+
+int main()
+{
+  std::cout << "Warning: filesystem feature is not present on the system, nothing will be tested\n";
+  return 0;
+}
+
+#endif