diff --git a/src/Airports/dynamics.cxx b/src/Airports/dynamics.cxx
index 1b5b0bd41..d712b5be5 100644
--- a/src/Airports/dynamics.cxx
+++ b/src/Airports/dynamics.cxx
@@ -186,7 +186,6 @@ public:
 private:
     void populate()
     {
-#if !defined(FG_TESTLIB)
         SGVec3d cartAirportPos = m_airport->cart();
         FGAIManager* aiManager = globals->get_subsystem<FGAIManager>();
         for (auto ai : aiManager->get_ai_list()) {
@@ -199,7 +198,6 @@ private:
 
             m_cache.push_back(cart);
         }
-#endif
         m_populated = true;
     }
 
diff --git a/src/Environment/environment_mgr.cxx b/src/Environment/environment_mgr.cxx
index 3fdb9db06..49ec2258e 100644
--- a/src/Environment/environment_mgr.cxx
+++ b/src/Environment/environment_mgr.cxx
@@ -27,12 +27,8 @@
 #include <simgear/constants.h>
 #include <simgear/debug/logstream.hxx>
 
-#ifdef FG_TESTLIB
-#include <tests/fake_sgSky.hxx>
-#else
 #include <simgear/scene/sky/sky.hxx>
 #include <simgear/scene/model/particles.hxx>
-#endif
 #include <simgear/structure/event_mgr.hxx>
 
 #include <Main/main.hxx>
@@ -52,7 +48,6 @@
 #include "gravity.hxx"
 #include "magvarmanager.hxx"
 
-#ifndef FG_TESTLIB
 class FG3DCloudsListener : public SGPropertyChangeListener {
 public:
   FG3DCloudsListener( FGClouds * fgClouds );
@@ -83,7 +78,6 @@ void FG3DCloudsListener::valueChanged( SGPropertyNode * node )
 {
   _fgClouds->set_3dClouds( _enableNode->getBoolValue() );
 }
-#endif
 
 FGEnvironmentMgr::FGEnvironmentMgr () :
   _environment(new FGEnvironment()),
@@ -92,17 +86,13 @@ FGEnvironmentMgr::FGEnvironmentMgr () :
   _3dCloudsEnableListener(nullptr),
   _sky(globals->get_renderer()->getSky())
 {
-#ifndef FG_TESTLIB
   fgClouds = new FGClouds;
   _3dCloudsEnableListener = new FG3DCloudsListener(fgClouds);
-#endif
   set_subsystem("controller", Environment::LayerInterpolateController::createInstance( fgGetNode("/environment/config", true ) ));
 
   set_subsystem("precipitation", new FGPrecipitationMgr);
-#ifndef FG_TESTLIB
   set_subsystem("realwx", Environment::RealWxController::createInstance( fgGetNode("/environment/realwx", true ) ), 1.0 );
   set_subsystem("terrainsampler", Environment::TerrainSampler::createInstance( fgGetNode("/environment/terrain", true ) ));
-#endif
   set_subsystem("ridgelift", new FGRidgeLift);
 
   set_subsystem("magvar", new FGMagVarManager);
@@ -117,10 +107,8 @@ FGEnvironmentMgr::~FGEnvironmentMgr ()
   remove_subsystem("controller");
   remove_subsystem("magvar");
 
-#ifndef FG_TESTLIB
   delete fgClouds;
   delete _3dCloudsEnableListener;
-#endif
   delete _environment;
 }
 
@@ -129,9 +117,7 @@ SGSubsystem::InitStatus FGEnvironmentMgr::incrementalInit()
 
   InitStatus r = SGSubsystemGroup::incrementalInit();
   if (r == INIT_DONE) {
-#ifndef FG_TESTLIB
     fgClouds->Init();
-#endif
     globals->get_event_mgr()->addTask("updateClosestAirport", this,
                                       &FGEnvironmentMgr::updateClosestAirport, 30 );
   }
@@ -164,11 +150,9 @@ FGEnvironmentMgr::bind ()
   _tiedProperties.Tie( "effective-visibility-m", _sky,
           &SGSky::get_visibility );
 
-#ifndef FG_TESTLIB
   _tiedProperties.Tie("rebuild-layers", fgClouds,
           &FGClouds::get_update_event,
           &FGClouds::set_update_event);
-#endif
 //  _tiedProperties.Tie("turbulence/use-cloud-turbulence", &sgEnviro,
 //          &SGEnviro::get_turbulence_enable_state,
 //          &SGEnviro::set_turbulence_enable_state);
@@ -256,14 +240,12 @@ FGEnvironmentMgr::update (double dt)
     SGGeod aircraftPos(globals->get_aircraft_position());
   _environment->set_elevation_ft( aircraftPos.getElevationFt() );
 
-#ifndef FG_TESTLIB
   simgear::Particles::setWindFrom( _environment->get_wind_from_heading_deg(),
                                    _environment->get_wind_speed_kt() );
   if( _cloudLayersDirty ) {
     _cloudLayersDirty = false;
     fgClouds->set_update_event( fgClouds->get_update_event()+1 );
   }
-#endif
 
   fgSetDouble( "/environment/gravitational-acceleration-mps2",
     Environment::Gravity::instance()->getGravity(aircraftPos));
diff --git a/src/Environment/precipitation_mgr.hxx b/src/Environment/precipitation_mgr.hxx
index 127ca2923..360ee3ff5 100644
--- a/src/Environment/precipitation_mgr.hxx
+++ b/src/Environment/precipitation_mgr.hxx
@@ -36,10 +36,8 @@
 class FGPrecipitationMgr : public SGSubsystem
 {
 private:
-#ifndef FG_TESTLIB
     osg::ref_ptr<osg::MatrixTransform> transform;
     osg::ref_ptr<SGPrecipitation> precipitation;
-#endif
     float getPrecipitationAtAltitudeMax(void);
     simgear::TiedPropertyList _tiedProperties;
 
diff --git a/src/Main/fg_props.cxx b/src/Main/fg_props.cxx
index fadca00a8..441303f05 100644
--- a/src/Main/fg_props.cxx
+++ b/src/Main/fg_props.cxx
@@ -240,10 +240,8 @@ setFreeze (bool f)
         }
     }
 
-#ifndef FG_TESTLIB
     // Pause the particle system
     simgear::Particles::setFrozen(f);
-#endif
 }
 
 
diff --git a/src/Main/globals.cxx b/src/Main/globals.cxx
index 6547777bf..75c730642 100644
--- a/src/Main/globals.cxx
+++ b/src/Main/globals.cxx
@@ -25,10 +25,8 @@
 #include <boost/foreach.hpp>
 #include <algorithm>
 
-#ifndef FG_TESTLIB
 #include <osgViewer/Viewer>
 #include <osgDB/Registry>
-#endif
 
 #include <simgear/structure/commands.hxx>
 #include <simgear/structure/exception.hxx>
@@ -54,7 +52,6 @@
 #include <GUI/gui.h>
 #include <Viewer/viewmgr.hxx>
 
-#ifndef FG_TESTLIB
 #include <Scenery/scenery.hxx>
 #include <Scenery/tilemgr.hxx>
 #include <Viewer/renderer.hxx>
@@ -63,7 +60,6 @@
 
 #include <simgear/sound/soundmgr.hxx>
 #include <simgear/scene/material/matlib.hxx>
-#endif
 
 #include "globals.hxx"
 #include "locale.hxx"
@@ -148,9 +144,7 @@ FGGlobals *globals = NULL;
 
 // Constructor
 FGGlobals::FGGlobals() :
-#ifndef FG_TESTLIB
     renderer( new FGRenderer ),
-#endif
     subsystem_mgr( new SGSubsystemMgr ),
     event_mgr( new SGEventMgr ),
     sim_time_sec( 0.0 ),
@@ -201,7 +195,6 @@ FGGlobals::~FGGlobals()
 
     // stop OSG threading first, to avoid thread races while we tear down
     // scene-graph pieces
-#ifndef FG_TESTLIB
     osg::ref_ptr<osgViewer::Viewer> vw(renderer->getViewer());
     if (vw) {
         // https://code.google.com/p/flightgear-bugs/issues/detail?id=1291
@@ -210,11 +203,9 @@ FGGlobals::~FGGlobals()
         // GraphicsContext)
         vw->stopThreading();
     }
-#endif
     subsystem_mgr->shutdown();
     subsystem_mgr->unbind();
 
-#ifndef FG_TESTLIB
     // don't cancel the pager until after shutdown, since AIModels (and
     // potentially others) can queue delete requests on the pager.
     if (vw && vw->getDatabasePager()) {
@@ -230,14 +221,11 @@ FGGlobals::~FGGlobals()
 
     FGFontCache::shutdown();
     fgCancelSnapShot();
-#endif
 
     delete subsystem_mgr;
     subsystem_mgr = NULL; // important so ::get_subsystem returns NULL
-#ifndef FG_TESTLIB
     vw = nullptr; // don't delete the viewer until now
     set_matlib(NULL);
-#endif
 
     delete time_params;
     delete channel_options_list;
@@ -245,9 +233,7 @@ FGGlobals::~FGGlobals()
     delete channellist;
 
     simgear::PropertyObjectBase::setDefaultRoot(NULL);
-#ifndef FG_TESTLIB
     simgear::SGModelLib::resetPropertyRoot();
-#endif
     delete locale;
     locale = NULL;
 
@@ -520,14 +506,12 @@ FGGlobals::get_renderer () const
 
 void FGGlobals::set_renderer(FGRenderer *render)
 {
-  #ifndef FG_TESTLIB
     if (render == renderer) {
         return;
     }
 
     delete renderer;
     renderer = render;
-#endif
 }
 
 SGSubsystemMgr *
@@ -870,11 +854,7 @@ void FGGlobals::set_warp_delta( long int d )
 
 FGScenery* FGGlobals::get_scenery () const
 {
-#ifdef FG_TESTLIB
-    return nullptr;
-#else
     return get_subsystem<FGScenery>();
-#endif
 }
 
 FGViewMgr *FGGlobals::get_viewmgr() const
@@ -890,9 +870,7 @@ flightgear::View* FGGlobals::get_current_view () const
 
 void FGGlobals::set_matlib( SGMaterialLib *m )
 {
-#ifndef FG_TESTLIB
     matlib = m;
-#endif
 }
 
 FGControls *FGGlobals::get_controls() const
diff --git a/src/Main/globals.hxx b/src/Main/globals.hxx
index 877b0411e..843e835c6 100644
--- a/src/Main/globals.hxx
+++ b/src/Main/globals.hxx
@@ -118,10 +118,8 @@ private:
     // Time structure
     SGTime *time_params;
 
-#ifndef FG_TESTLIB
     // Material properties library
     SGSharedPtr<SGMaterialLib> matlib;
-#endif
 
     SGCommandMgr *commands;
 
@@ -324,11 +322,7 @@ public:
 
     inline SGMaterialLib *get_matlib() const
     {
-    #ifdef FG_TESTLIB
-      return nullptr;
-    #else
       return matlib;
-    #endif
     }
     void set_matlib( SGMaterialLib *m );
 
diff --git a/src/Main/options.cxx b/src/Main/options.cxx
index 13c3b0ade..41e563428 100644
--- a/src/Main/options.cxx
+++ b/src/Main/options.cxx
@@ -60,7 +60,7 @@
 #include <GUI/gui.h>
 #include <GUI/MessageBox.hxx>
 
-#if defined(HAVE_QT) && !defined(FG_TESTLIB)
+#if defined(HAVE_QT)
 #include <GUI/QtLauncher.hxx>
 #include <GUI/SetupRootDialog.hxx>
 #endif
@@ -238,12 +238,10 @@ void fgSetDefaults ()
     SGPropertyNode* v = globals->get_props()->getNode("/sim/version", true);
     v->setValueReadOnly("flightgear", FLIGHTGEAR_VERSION);
     v->setValueReadOnly("simgear", SG_STRINGIZE(SIMGEAR_VERSION));
-#ifndef FG_TESTLIB
     v->setValueReadOnly("openscenegraph", osgGetVersion());
 #if OSG_VERSION_LESS_THAN(3,5,2)
     v->setValueReadOnly("openscenegraph-thread-safe-reference-counting",
                          osg::Referenced::getThreadSafeReferenceCounting());
-#endif
 #endif
     v->setValueReadOnly("revision", REVISION);
     v->setValueReadOnly("build-number", HUDSON_BUILD_NUMBER);
@@ -1036,14 +1034,12 @@ fgOptJpgHttpd( const char * arg )
 static int
 fgOptHttpd( const char * arg )
 {
-#ifndef FG_TESTLIB
     // port may be any valid address:port notation
     // like 127.0.0.1:8080
     // or just the port 8080
     string port = simgear::strutils::strip(string(arg));
     if( port.empty() ) return FG_OPTIONS_ERROR;
     fgSetString( string(flightgear::http::PROPERTY_ROOT).append("/options/listening-port").c_str(), port );
-#endif
     return FG_OPTIONS_OK;
 }
 
@@ -2109,9 +2105,7 @@ void Options::init(int argc, char **argv, const SGPath& appDataPath)
   }
 
   if (!p->shouldLoadDefaultConfig) {
-#if !defined(FG_TESTLIB)
     setupRoot(argc, argv);
-#endif
     return;
   }
 
@@ -2750,9 +2744,7 @@ void Options::showVersion() const
     PathList scn = globals->get_fg_scenery();
     cout << SGPath::join(scn, SGPath::pathListSep) << endl;
     cout << "SimGear version: " << SG_STRINGIZE(SIMGEAR_VERSION) << endl;
-#ifndef FG_TESTLIB
     cout << "OSG version: " << osgGetVersion() << endl;
-#endif
     cout << "PLIB version: " << PLIB_VERSION << endl;
 }
 
@@ -2890,7 +2882,7 @@ void Options::setupRoot(int argc, char **argv)
         root = SGPath::fromLocal8Bit(envp);
         SG_LOG(SG_GENERAL, SG_INFO, "set from FG_ROOT env var: fg_root = " << root );
     } else {
-#if defined(HAVE_QT) && !defined(FG_TESTLIB)
+#if defined(HAVE_QT)
         flightgear::initApp(argc, argv);
         root = SetupRootDialog::restoreUserSelectedRoot();
 #endif
@@ -2908,7 +2900,7 @@ void Options::setupRoot(int argc, char **argv)
     string base_version = fgBasePackageVersion(root);
 
 
-#if defined(HAVE_QT) && !defined(FG_TESTLIB)
+#if defined(HAVE_QT)
     // only compare major and minor version, not the patch level.
     const int versionComp = simgear::strutils::compare_versions(FLIGHTGEAR_VERSION, base_version, 2);
 
diff --git a/src/Main/positioninit.cxx b/src/Main/positioninit.cxx
index 3221ecd07..38e57c7a2 100644
--- a/src/Main/positioninit.cxx
+++ b/src/Main/positioninit.cxx
@@ -456,7 +456,6 @@ static bool fgSetPosFromNAV( const string& id,
 
 static InitPosResult setInitialPosFromCarrier( const string& carrier )
 {
-#if !defined(FG_TESTLIB)
   const auto initialPos = FGAICarrier::initialPositionForCarrier(carrier);
   if (initialPos.first) {
     // set these so scenery system has a vicinity to work with, and
@@ -468,7 +467,6 @@ static InitPosResult setInitialPosFromCarrier( const string& carrier )
   }
   
   SG_LOG( SG_GENERAL, SG_ALERT, "Failed to locate aircraft carrier = " << carrier );
-#endif
   return Failure;
 }
 
@@ -476,7 +474,6 @@ static InitPosResult setInitialPosFromCarrier( const string& carrier )
 static InitPosResult setFinalPosFromCarrier( const string& carrier, const string& posid )
 {
   
-#if !defined(FG_TESTLIB)
   SGSharedPtr<FGAICarrier> carrierRef = FGAICarrier::findCarrierByNameOrPennant(carrier);
   if (!carrierRef) {
     SG_LOG( SG_GENERAL, SG_ALERT, "Failed to locate aircraft carrier = "
@@ -540,7 +537,6 @@ static InitPosResult setFinalPosFromCarrier( const string& carrier, const string
     /////////
     return ExactPosition;
   }
-#endif
   SG_LOG( SG_GENERAL, SG_ALERT, "Failed to locate aircraft carrier = " << carrier );
   return Failure;
 }
diff --git a/src/Scripting/NasalPositioned.cxx b/src/Scripting/NasalPositioned.cxx
index 21374c528..ef22cb27b 100644
--- a/src/Scripting/NasalPositioned.cxx
+++ b/src/Scripting/NasalPositioned.cxx
@@ -1262,7 +1262,6 @@ static naRef f_geodinfo(naContext c, naRef me, int argc, naRef* args)
   naRef vec = naNewVector(c);
   naVec_append(vec, naNum(elev));
 
-#ifndef FG_TESTLIB
   naRef matdata = naNil();
 
   const SGMaterial *mat = dynamic_cast<const SGMaterial *>(material);
@@ -1281,7 +1280,6 @@ static naRef f_geodinfo(naContext c, naRef me, int argc, naRef* args)
     HASHSET("light_coverage", 14, naNum(mat->get_light_coverage()));
   }
   naVec_append(vec, matdata);
-#endif
   return vec;
 #undef HASHSET
 }
diff --git a/src/Scripting/NasalSys.cxx b/src/Scripting/NasalSys.cxx
index 741d76a4f..c97fbacf5 100644
--- a/src/Scripting/NasalSys.cxx
+++ b/src/Scripting/NasalSys.cxx
@@ -913,10 +913,8 @@ void FGNasalSys::init()
     initNasalPositioned(_globals, _context);
     initNasalPositioned_cppbind(_globals, _context);
     initNasalAircraft(_globals, _context);
-#ifndef FG_TESTLIB
     NasalClipboard::init(this);
     initNasalCanvas(_globals, _context);
-#endif
     initNasalCondition(_globals, _context);
     initNasalHTTP(_globals, _context);
     initNasalSGPath(_globals, _context);
@@ -1016,17 +1014,14 @@ naRef FGNasalSys::wrappedPropsNode(SGPropertyNode* aProps)
 
 void FGNasalSys::update(double)
 {
-#ifndef FG_TESTLIB
     if( NasalClipboard::getInstance() )
         NasalClipboard::getInstance()->update();
-#endif
     if(!_dead_listener.empty()) {
         vector<FGNasalListener *>::iterator it, end = _dead_listener.end();
         for(it = _dead_listener.begin(); it != end; ++it) delete *it;
         _dead_listener.clear();
     }
 
-#ifndef FG_TESTLIB
     if (!_loadList.empty())
     {
         if( _delay_load )
@@ -1042,7 +1037,6 @@ void FGNasalSys::update(double)
         // (only unload one per update loop to avoid excessive lags)
         _unloadList.pop()->unload();
     }
-#endif
     // Destroy all queued ghosts
     nasal::ghostProcessDestroyList();
 
@@ -1478,18 +1472,14 @@ naRef FGNasalSys::removeListener(naContext c, int argc, naRef* args)
 
 void FGNasalSys::registerToLoad(FGNasalModelData *data)
 {
-#ifndef FG_TESTLIB
   if( _loadList.empty() )
     _delay_load = true;
   _loadList.push(data);
-#endif
 }
 
 void FGNasalSys::registerToUnload(FGNasalModelData *data)
 {
-#ifndef FG_TESTLIB
     _unloadList.push(data);
-#endif
 }
 
 void FGNasalSys::addCommand(naRef func, const std::string& name)
diff --git a/src/Scripting/NasalSys.hxx b/src/Scripting/NasalSys.hxx
index c5bb7b9b7..502fd9dbc 100644
--- a/src/Scripting/NasalSys.hxx
+++ b/src/Scripting/NasalSys.hxx
@@ -160,10 +160,8 @@ private:
     //friend class FGNasalScript;
     friend class FGNasalListener;
     friend class FGNasalModuleListener;
-#ifndef FG_TESTLIB
     SGLockedQueue<SGSharedPtr<FGNasalModelData> > _loadList;
     SGLockedQueue<SGSharedPtr<FGNasalModelData> > _unloadList;
-#endif
     // Delay removing items of the _loadList to ensure the are already attached
     // to the scene graph (eg. enables to retrieve world position in load
     // callback).
diff --git a/src/Viewer/view.cxx b/src/Viewer/view.cxx
index ae3d3419c..7cb3a1f6b 100644
--- a/src/Viewer/view.cxx
+++ b/src/Viewer/view.cxx
@@ -1078,11 +1078,7 @@ double View::getOrientation_z() const{
 
 double View::get_aspect_ratio() const
 {
-#ifdef FG_TESTLIB
-    return 4.0 / 3.0;
-#else
     return flightgear::CameraGroup::getDefault()->getMasterAspectRatio();
-#endif
 }
 
 double View::getLon_deg() const
diff --git a/src/Viewer/viewmgr.cxx b/src/Viewer/viewmgr.cxx
index 6e3c6bb0f..67a2e53cc 100644
--- a/src/Viewer/viewmgr.cxx
+++ b/src/Viewer/viewmgr.cxx
@@ -137,15 +137,12 @@ FGViewMgr::update (double dt)
   // Update the current view
   currentView->update(dt);
 
-#ifndef FG_TESTLIB
-
 // update the camera now
     osg::ref_ptr<flightgear::CameraGroup> cameraGroup = flightgear::CameraGroup::getDefault();
     cameraGroup->update(toOsg(currentView->getViewPosition()),
                         toOsg(currentView->getViewOrientation()));
     cameraGroup->setCameraParameters(currentView->get_v_fov(),
                                      cameraGroup->getMasterAspectRatio());
-#endif
 }
 
 void FGViewMgr::clear()
diff --git a/test_suite/FGTestApi/globals.cxx b/test_suite/FGTestApi/globals.cxx
index 8e47f2b6a..21f759f3b 100644
--- a/test_suite/FGTestApi/globals.cxx
+++ b/test_suite/FGTestApi/globals.cxx
@@ -4,7 +4,7 @@
 
 #include "globals.hxx"
 
-#if defined(HAVE_QT) && !defined(FG_TESTLIB)
+#if defined(HAVE_QT)
 #include <GUI/QtLauncher.hxx>
 #endif
 
@@ -57,7 +57,7 @@ void shutdownTestGlobals()
 {
     // The QApplication instance must be destroyed before exit() begins, see
     // <https://bugreports.qt.io/browse/QTBUG-48709> (otherwise, segfault).
-#if defined(HAVE_QT) && !defined(FG_TESTLIB)
+#if defined(HAVE_QT)
     flightgear::shutdownQtApp();
 #endif