math: Add integer valued vector types.

[simgear.git] / simgear / math / SGVec3.hxx

diff --git a/simgear/math/SGVec3.hxx b/simgear/math/SGVec3.hxx
index 56775d3ede34ba6affc15d8fa37076c684311875..dbc8af543bf9a5d39a933be30d55e32b9dfc9c43 100644 (file)
--- 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 {