diff --git a/src/Main/viewer.cxx b/src/Main/viewer.cxx index 49d77cf5b..97ae34519 100644 --- a/src/Main/viewer.cxx +++ b/src/Main/viewer.cxx @@ -35,6 +35,7 @@ #include <simgear/debug/logstream.hxx> #include <simgear/constants.h> #include <simgear/scene/model/placement.hxx> +#include <simgear/scene/util/OsgMath.hxx> #include <Main/globals.hxx> #include <Scenery/scenery.hxx>