diff -NrU5 FlightGear-1.9.1.orig/utils/GPSsmooth/UGear_command.cxx FlightGear-1.9.1/utils/GPSsmooth/UGear_command.cxx
--- FlightGear-1.9.1.orig/utils/GPSsmooth/UGear_command.cxx	2009-05-17 13:36:08.000000000 -0600
+++ FlightGear-1.9.1/utils/GPSsmooth/UGear_command.cxx	2009-05-17 13:39:08.000000000 -0600
@@ -1,6 +1,7 @@
 #include <cstring>
+#include <cstdio>
 
 #include "UGear_command.hxx"
 
 
 UGCommand::UGCommand():