X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fmath%2FSGVec3.hxx;h=dbc8af543bf9a5d39a933be30d55e32b9dfc9c43;hb=914d3e6a2b323cf9f186cbef2aef7865ea07b309;hp=56775d3ede34ba6affc15d8fa37076c684311875;hpb=2cc5e776b335e2d18573270bbe9ded1f834ea3d1;p=simgear.git

diff --git a/simgear/math/SGVec3.hxx b/simgear/math/SGVec3.hxx
index 56775d3e..dbc8af54 100644
--- a/simgear/math/SGVec3.hxx
+++ b/simgear/math/SGVec3.hxx
@@ -18,6 +18,8 @@
 #ifndef SGVec3_H
 #define SGVec3_H
 
+#include <iosfwd>
+
 /// 3D Vector Class
 template<typename T>
 class SGVec3 {