diff --git a/src/FDM/JSBSim/FGAerodynamics.cpp b/src/FDM/JSBSim/FGAerodynamics.cpp
index b052fe923..209d864ce 100644
--- a/src/FDM/JSBSim/FGAerodynamics.cpp
+++ b/src/FDM/JSBSim/FGAerodynamics.cpp
@@ -36,6 +36,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGAerodynamics.h"
 #include "FGPropagate.h"
 #include "FGAircraft.h"
diff --git a/src/FDM/JSBSim/FGAircraft.cpp b/src/FDM/JSBSim/FGAircraft.cpp
index 152dca6d9..23caea68f 100644
--- a/src/FDM/JSBSim/FGAircraft.cpp
+++ b/src/FDM/JSBSim/FGAircraft.cpp
@@ -48,6 +48,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <sys/stat.h>
 #include <sys/types.h>
 
diff --git a/src/FDM/JSBSim/FGCoefficient.cpp b/src/FDM/JSBSim/FGCoefficient.cpp
index c003edd3d..1e2aab5e8 100644
--- a/src/FDM/JSBSim/FGCoefficient.cpp
+++ b/src/FDM/JSBSim/FGCoefficient.cpp
@@ -44,6 +44,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <stdio.h>
 
 #include "FGCoefficient.h"
diff --git a/src/FDM/JSBSim/FGColumnVector3.cpp b/src/FDM/JSBSim/FGColumnVector3.cpp
index a52cc6e10..8cdfd64a6 100644
--- a/src/FDM/JSBSim/FGColumnVector3.cpp
+++ b/src/FDM/JSBSim/FGColumnVector3.cpp
@@ -18,6 +18,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGColumnVector3.h"
 #include <cstdio>
 
diff --git a/src/FDM/JSBSim/FGConfigFile.cpp b/src/FDM/JSBSim/FGConfigFile.cpp
index f994aba06..4502e51e3 100644
--- a/src/FDM/JSBSim/FGConfigFile.cpp
+++ b/src/FDM/JSBSim/FGConfigFile.cpp
@@ -17,6 +17,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGConfigFile.h"
 #include <stdlib.h>
 #include <math.h>
diff --git a/src/FDM/JSBSim/FGElectric.cpp b/src/FDM/JSBSim/FGElectric.cpp
index c62c5e328..0f995b8af 100644
--- a/src/FDM/JSBSim/FGElectric.cpp
+++ b/src/FDM/JSBSim/FGElectric.cpp
@@ -38,6 +38,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGElectric.h"
 #include "FGPropulsion.h"
 
diff --git a/src/FDM/JSBSim/FGEngine.cpp b/src/FDM/JSBSim/FGEngine.cpp
index f0153d998..ea7edca07 100644
--- a/src/FDM/JSBSim/FGEngine.cpp
+++ b/src/FDM/JSBSim/FGEngine.cpp
@@ -38,6 +38,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #ifdef FGFS
 #  include <simgear/compiler.h>
 #  ifdef SG_HAVE_STD_INCLUDES
diff --git a/src/FDM/JSBSim/FGFCS.cpp b/src/FDM/JSBSim/FGFCS.cpp
index 4405ad559..29fd534f3 100644
--- a/src/FDM/JSBSim/FGFCS.cpp
+++ b/src/FDM/JSBSim/FGFCS.cpp
@@ -37,6 +37,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGFCS.h"
 #include "FGFDMExec.h"
 #include "FGPropertyManager.h"
diff --git a/src/FDM/JSBSim/FGFDMExec.cpp b/src/FDM/JSBSim/FGFDMExec.cpp
index 2110fb0d9..ab37dac38 100644
--- a/src/FDM/JSBSim/FGFDMExec.cpp
+++ b/src/FDM/JSBSim/FGFDMExec.cpp
@@ -41,6 +41,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #ifdef FGFS
 #  include <simgear/compiler.h>
 #  include STL_IOSTREAM
diff --git a/src/FDM/JSBSim/FGFactorGroup.cpp b/src/FDM/JSBSim/FGFactorGroup.cpp
index dce8f32dc..e39d3a5d3 100644
--- a/src/FDM/JSBSim/FGFactorGroup.cpp
+++ b/src/FDM/JSBSim/FGFactorGroup.cpp
@@ -45,6 +45,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGCoefficient.h"
 #include "FGFactorGroup.h"
 #include "FGState.h"
diff --git a/src/FDM/JSBSim/FGGroundCallback.cpp b/src/FDM/JSBSim/FGGroundCallback.cpp
index 59430150f..1daf1b9de 100644
--- a/src/FDM/JSBSim/FGGroundCallback.cpp
+++ b/src/FDM/JSBSim/FGGroundCallback.cpp
@@ -31,6 +31,10 @@ HISTORY
 SENTRY
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #include "FGColumnVector3.h"
 #include "FGLocation.h"
 #include "FGGroundCallback.h"
diff --git a/src/FDM/JSBSim/FGGroundReactions.cpp b/src/FDM/JSBSim/FGGroundReactions.cpp
index a075a1c2c..a4852dc50 100644
--- a/src/FDM/JSBSim/FGGroundReactions.cpp
+++ b/src/FDM/JSBSim/FGGroundReactions.cpp
@@ -35,6 +35,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <sstream>
 #include <iomanip>
 
diff --git a/src/FDM/JSBSim/FGInertial.cpp b/src/FDM/JSBSim/FGInertial.cpp
index d75854a51..e1cbe9501 100644
--- a/src/FDM/JSBSim/FGInertial.cpp
+++ b/src/FDM/JSBSim/FGInertial.cpp
@@ -35,6 +35,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGInertial.h"
 #include "FGPropagate.h"
 #include "FGState.h"
diff --git a/src/FDM/JSBSim/FGMatrix33.cpp b/src/FDM/JSBSim/FGMatrix33.cpp
index 0d42129f1..5027f4c73 100644
--- a/src/FDM/JSBSim/FGMatrix33.cpp
+++ b/src/FDM/JSBSim/FGMatrix33.cpp
@@ -18,6 +18,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGMatrix33.h"
 #include "FGColumnVector3.h"
 
diff --git a/src/FDM/JSBSim/FGNozzle.cpp b/src/FDM/JSBSim/FGNozzle.cpp
index c159c12a7..fa047037f 100644
--- a/src/FDM/JSBSim/FGNozzle.cpp
+++ b/src/FDM/JSBSim/FGNozzle.cpp
@@ -35,6 +35,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <sstream>
 
 #include "FGNozzle.h"
diff --git a/src/FDM/JSBSim/FGPiston.cpp b/src/FDM/JSBSim/FGPiston.cpp
index 21a619778..9c7530ea6 100644
--- a/src/FDM/JSBSim/FGPiston.cpp
+++ b/src/FDM/JSBSim/FGPiston.cpp
@@ -39,6 +39,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <sstream>
 
 #include "FGPiston.h"
diff --git a/src/FDM/JSBSim/FGPropagate.cpp b/src/FDM/JSBSim/FGPropagate.cpp
index 5c5132f2e..4d5d67767 100644
--- a/src/FDM/JSBSim/FGPropagate.cpp
+++ b/src/FDM/JSBSim/FGPropagate.cpp
@@ -53,6 +53,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #ifdef FGFS
 #  include <simgear/compiler.h>
 #  ifdef SG_HAVE_STD_INCLUDES
diff --git a/src/FDM/JSBSim/FGPropeller.cpp b/src/FDM/JSBSim/FGPropeller.cpp
index d205a3a62..6ef0f53a1 100644
--- a/src/FDM/JSBSim/FGPropeller.cpp
+++ b/src/FDM/JSBSim/FGPropeller.cpp
@@ -35,6 +35,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <sstream>
 
 #include "FGPropeller.h"
diff --git a/src/FDM/JSBSim/FGPropulsion.cpp b/src/FDM/JSBSim/FGPropulsion.cpp
index 11443f7cf..19d7e9aca 100644
--- a/src/FDM/JSBSim/FGPropulsion.cpp
+++ b/src/FDM/JSBSim/FGPropulsion.cpp
@@ -44,6 +44,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGPropulsion.h"
 #include "FGRocket.h"
 #include "FGTurbine.h"
diff --git a/src/FDM/JSBSim/FGQuaternion.cpp b/src/FDM/JSBSim/FGQuaternion.cpp
index 55edcf88e..bc32c8137 100644
--- a/src/FDM/JSBSim/FGQuaternion.cpp
+++ b/src/FDM/JSBSim/FGQuaternion.cpp
@@ -38,6 +38,10 @@ SENTRY
   INCLUDES
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 #ifdef FGFS
 #  include <math.h>
 #  include <simgear/compiler.h>
diff --git a/src/FDM/JSBSim/FGRocket.cpp b/src/FDM/JSBSim/FGRocket.cpp
index c7131f341..e278cca93 100644
--- a/src/FDM/JSBSim/FGRocket.cpp
+++ b/src/FDM/JSBSim/FGRocket.cpp
@@ -38,6 +38,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <sstream>
 
 #include "FGRocket.h"
diff --git a/src/FDM/JSBSim/FGRotor.cpp b/src/FDM/JSBSim/FGRotor.cpp
index b1efdde76..58fee4572 100644
--- a/src/FDM/JSBSim/FGRotor.cpp
+++ b/src/FDM/JSBSim/FGRotor.cpp
@@ -35,6 +35,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGRotor.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/FGScript.cpp b/src/FDM/JSBSim/FGScript.cpp
index 8634b2ebb..4fe946df7 100644
--- a/src/FDM/JSBSim/FGScript.cpp
+++ b/src/FDM/JSBSim/FGScript.cpp
@@ -41,6 +41,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #ifdef FGFS
 #  include <simgear/compiler.h>
 #  include STL_IOSTREAM
diff --git a/src/FDM/JSBSim/FGState.cpp b/src/FDM/JSBSim/FGState.cpp
index 1802205b3..1f581b96a 100644
--- a/src/FDM/JSBSim/FGState.cpp
+++ b/src/FDM/JSBSim/FGState.cpp
@@ -36,6 +36,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #ifdef FGFS
 #  include <simgear/compiler.h>
 #  include <math.h>
diff --git a/src/FDM/JSBSim/FGTable.cpp b/src/FDM/JSBSim/FGTable.cpp
index f54418f20..b2b869d8f 100644
--- a/src/FDM/JSBSim/FGTable.cpp
+++ b/src/FDM/JSBSim/FGTable.cpp
@@ -36,6 +36,10 @@ JSB  1/9/00          Created
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGTable.h"
 
 #if defined ( sgi ) && !defined( __GNUC__ ) && (_COMPILER_VERSION < 740)
diff --git a/src/FDM/JSBSim/FGThruster.cpp b/src/FDM/JSBSim/FGThruster.cpp
index 4d4a4edcb..24904aa20 100644
--- a/src/FDM/JSBSim/FGThruster.cpp
+++ b/src/FDM/JSBSim/FGThruster.cpp
@@ -35,6 +35,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <sstream>
 
 #include "FGThruster.h"
diff --git a/src/FDM/JSBSim/FGTrimAxis.cpp b/src/FDM/JSBSim/FGTrimAxis.cpp
index 365947f04..7dd968228 100644
--- a/src/FDM/JSBSim/FGTrimAxis.cpp
+++ b/src/FDM/JSBSim/FGTrimAxis.cpp
@@ -36,6 +36,10 @@ INCLUDES
 #  pragma warning (disable : 4786)
 #endif
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <string>
 #include <stdlib.h>
 
diff --git a/src/FDM/JSBSim/FGTurbine.cpp b/src/FDM/JSBSim/FGTurbine.cpp
index d43031b38..03c6a3587 100644
--- a/src/FDM/JSBSim/FGTurbine.cpp
+++ b/src/FDM/JSBSim/FGTurbine.cpp
@@ -39,6 +39,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <vector>
 #include <sstream>
 
diff --git a/src/FDM/JSBSim/FGfdmSocket.cpp b/src/FDM/JSBSim/FGfdmSocket.cpp
index b63b65abc..c6672a749 100644
--- a/src/FDM/JSBSim/FGfdmSocket.cpp
+++ b/src/FDM/JSBSim/FGfdmSocket.cpp
@@ -37,6 +37,10 @@ HISTORY
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGfdmSocket.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGCondition.cpp b/src/FDM/JSBSim/filtersjb/FGCondition.cpp
index af7510b06..e3c527171 100644
--- a/src/FDM/JSBSim/filtersjb/FGCondition.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGCondition.cpp
@@ -34,6 +34,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGCondition.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGDeadBand.cpp b/src/FDM/JSBSim/filtersjb/FGDeadBand.cpp
index 5776c13c3..0158ecd3f 100644
--- a/src/FDM/JSBSim/filtersjb/FGDeadBand.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGDeadBand.cpp
@@ -37,6 +37,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGDeadBand.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGFCSComponent.cpp b/src/FDM/JSBSim/filtersjb/FGFCSComponent.cpp
index 41bb1ac39..4833a645c 100644
--- a/src/FDM/JSBSim/filtersjb/FGFCSComponent.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGFCSComponent.cpp
@@ -37,6 +37,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGFCSComponent.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGFilter.cpp b/src/FDM/JSBSim/filtersjb/FGFilter.cpp
index 3ecf6523d..e1a143bd0 100644
--- a/src/FDM/JSBSim/filtersjb/FGFilter.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGFilter.cpp
@@ -37,6 +37,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGFilter.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGGain.cpp b/src/FDM/JSBSim/filtersjb/FGGain.cpp
index 7417c9395..79b8611a5 100644
--- a/src/FDM/JSBSim/filtersjb/FGGain.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGGain.cpp
@@ -37,6 +37,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGGain.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGGradient.cpp b/src/FDM/JSBSim/filtersjb/FGGradient.cpp
index 270ea2746..359a9edb8 100644
--- a/src/FDM/JSBSim/filtersjb/FGGradient.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGGradient.cpp
@@ -37,6 +37,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGGradient.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGKinemat.cpp b/src/FDM/JSBSim/filtersjb/FGKinemat.cpp
index e71159574..c9b9f460e 100644
--- a/src/FDM/JSBSim/filtersjb/FGKinemat.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGKinemat.cpp
@@ -37,6 +37,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include <math.h>
 #include <float.h>
 
diff --git a/src/FDM/JSBSim/filtersjb/FGSummer.cpp b/src/FDM/JSBSim/filtersjb/FGSummer.cpp
index efd2c8f10..68b8fa66a 100644
--- a/src/FDM/JSBSim/filtersjb/FGSummer.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGSummer.cpp
@@ -37,6 +37,10 @@ COMMENTS, REFERENCES,  and NOTES
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGSummer.h"
 
 namespace JSBSim {
diff --git a/src/FDM/JSBSim/filtersjb/FGSwitch.cpp b/src/FDM/JSBSim/filtersjb/FGSwitch.cpp
index b60f0cc82..ca5058de5 100644
--- a/src/FDM/JSBSim/filtersjb/FGSwitch.cpp
+++ b/src/FDM/JSBSim/filtersjb/FGSwitch.cpp
@@ -58,6 +58,10 @@ Also, see the header file (FGSwitch.h) for further details.
 INCLUDES
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
 #include "FGSwitch.h"
 
 namespace JSBSim {