From 8320b37ce6659c14c0f6f6879ba8a5b0951d49d3 Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Mon, 28 Dec 2020 14:53:35 +0000
Subject: [PATCH] Fix Windows build failure

---
 src/Autopilot/digitalfilter.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Autopilot/digitalfilter.cxx b/src/Autopilot/digitalfilter.cxx
index 642a2bc47..3ca30e350 100644
--- a/src/Autopilot/digitalfilter.cxx
+++ b/src/Autopilot/digitalfilter.cxx
@@ -26,7 +26,9 @@
 //
 
 #include "digitalfilter.hxx"
+
 #include <deque>
+#include <algorithm>
 
 #include <simgear/misc/strutils.hxx>