diff --git a/src/Input/FGDeviceConfigurationMap.cxx b/src/Input/FGDeviceConfigurationMap.cxx
index 1cd4f1c4d..413222f04 100644
--- a/src/Input/FGDeviceConfigurationMap.cxx
+++ b/src/Input/FGDeviceConfigurationMap.cxx
@@ -27,6 +27,9 @@
 #endif
 
 #include "FGDeviceConfigurationMap.hxx"
+
+#include <plib/ul.h>
+
 #include <simgear/props/props_io.hxx>
 #include <Main/globals.hxx>
 
diff --git a/src/Scripting/nasal-props.cxx b/src/Scripting/nasal-props.cxx
index 4ffc4d601..9f309903a 100644
--- a/src/Scripting/nasal-props.cxx
+++ b/src/Scripting/nasal-props.cxx
@@ -3,6 +3,9 @@
 #  include "config.h"
 #endif
 
+#include <cstring>
+
+#include <simgear/math/SGMath.hxx>
 #include <simgear/nasal/nasal.h>
 #include <simgear/props/props.hxx>
 
@@ -10,6 +13,8 @@
 
 #include "NasalSys.hxx"
 
+using namespace std;
+
 // Implementation of a Nasal wrapper for the SGPropertyNode class,
 // using the Nasal "ghost" (er... Garbage collection Handle for
 // OutSide Thingy) facility.