From 0e2e4862962fca59639468bb51b7fb8e6acfaa10 Mon Sep 17 00:00:00 2001
From: Andreas Fabri <andreas.fabri@geometryfactory.com>
Date: Fri, 11 Apr 2025 08:48:00 +0100
Subject: [PATCH] #ifdef the include of <ranges>

---
 Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp b/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
index 2989c97d4e6..0358818c018 100644
--- a/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
+++ b/Triangulation_3/test/Triangulation_3/cdt_3_from_off.cpp
@@ -25,7 +25,11 @@
 #include <fstream>
 #include <string>
 #include <string_view>
+
+#if __cpp_lib_concepts >= 201806L && __cpp_lib_ranges >= 201911L
 #include <ranges>
+#endif
+
 #include <optional>
 #include <chrono>