From 3eb00b9794d81f318c3ee945ef1e0858016c9708 Mon Sep 17 00:00:00 2001
From: Mathis Logemann <mathisloge@gmail.com>
Date: Sat, 21 Nov 2020 15:41:03 +0100
Subject: [PATCH] use feature test for <execution>

---
 src/image_util.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/image_util.cpp b/src/image_util.cpp
index d8811082c..3f59abf25 100644
--- a/src/image_util.cpp
+++ b/src/image_util.cpp
@@ -54,7 +54,7 @@ MAPNIK_DISABLE_WARNING_POP
 #include <sstream>
 #include <algorithm>
 
-#if __cplusplus >= 201703L
+#if __cpp_lib_execution >= 201603
 #include <execution>
 #endif