From eefd87852958c5f47221d056bd6eebd2bb7a2e37 Mon Sep 17 00:00:00 2001
From: Scott Giese <scttgs0@gmail.com>
Date: Wed, 22 Dec 2021 23:50:37 -0600
Subject: [PATCH] AirportBuilder: missing header guard corrected.

---
 src/Airports/AirportBuilder.hxx | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/Airports/AirportBuilder.hxx b/src/Airports/AirportBuilder.hxx
index d2e2ffd67..a6e36bd99 100644
--- a/src/Airports/AirportBuilder.hxx
+++ b/src/Airports/AirportBuilder.hxx
@@ -20,6 +20,9 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 //
 // $Id$
+
+#pragma once
+
 #include <osgDB/Registry>
 #include "airport.hxx"
 #include <simgear/scene/material/Effect.hxx>