// Test harness.
////////////////////////////////////////////////////////////////////////
+#ifdef HAVE_CONFIG_H
+# include <simgear_config.h>
+#endif
+
#include <simgear/compiler.h>
#include <iostream>
+
+// working around MSVC weirdness with props.hxx and SGMathFwd
+#include <simgear/math/SGMath.hxx>
+
#include "props.hxx"
#include "props_io.hxx"