From fba418d20be369d459b8f847411b47b268fc90ea Mon Sep 17 00:00:00 2001
From: Artem Pavlenko <artem@mapnik.org>
Date: Thu, 10 Sep 2020 18:00:12 +0100
Subject: [PATCH] <execution> is available starting from c++17

---
 src/image_util.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/image_util.cpp b/src/image_util.cpp
index a825c9e91..0dc51f195 100644
--- a/src/image_util.cpp
+++ b/src/image_util.cpp
@@ -52,7 +52,10 @@
 #include <fstream>
 #include <sstream>
 #include <algorithm>
+
+#if __cplusplus >= 201703L
 #include <execution>
+#endif
 
 namespace mapnik
 {