X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FMain%2Ffg_props.hxx;h=41772ff358345d94f66eeab7b8f9563e9f26d7ae;hb=b587400846111cc4d6713dcdd38b715c97923d5a;hp=f1d6217c5816f42999b0dfe653aaaa0a1c8c0eb0;hpb=4cc30842565e25bd50e27477626c731a9de93b9a;p=flightgear.git

diff --git a/src/Main/fg_props.hxx b/src/Main/fg_props.hxx
index f1d6217c5..41772ff35 100644
--- a/src/Main/fg_props.hxx
+++ b/src/Main/fg_props.hxx
@@ -9,9 +9,10 @@
 #include <iosfwd>
 
 #include <simgear/structure/subsystem_mgr.hxx>
+#include <simgear/math/SGMath.hxx>
 
 #include <Main/globals.hxx>
-
+
 ////////////////////////////////////////////////////////////////////////
 // Property management.
 ////////////////////////////////////////////////////////////////////////