NavLib integration enabled for MacOS

cMake/FreeCAD_Helpers/InitializeFreeCADBuildOptions.cmake

@@ -142,12 +142,12 @@ macro(InitializeFreeCADBuildOptions)
     option(BUILD_CLOUD "Build the FreeCAD cloud module" OFF)
     option(ENABLE_DEVELOPER_TESTS "Build the FreeCAD unit tests suit" ON)
 
-    if(MSVC)
+    if(MSVC OR APPLE)
         set(FREECAD_3DCONNEXION_SUPPORT "NavLib" CACHE STRING "Select version of the 3Dconnexion device integration")
         set_property(CACHE FREECAD_3DCONNEXION_SUPPORT PROPERTY STRINGS "NavLib" "Raw input")
-    else(MSVC)
+    else(MSVC OR APPLE)
         set(FREECAD_3DCONNEXION_SUPPORT "Raw input")
-    endif(MSVC)
+    endif(MSVC OR APPLE)
 
     if(MSVC)
         option(BUILD_FEM_NETGEN "Build the FreeCAD FEM module with the NETGEN mesher" ON)

src/Gui/3Dconnexion/navlib/NavlibNavigation.cpp

@@ -122,6 +122,8 @@ CameraType NavlibInterface::getCamera() const
     return nullptr;
 }
 
+template SoCamera* NavlibInterface::getCamera<SoCamera*>() const;
+
 void NavlibInterface::onViewChanged(const Gui::MDIView* view)
 {
     if (view == nullptr)

src/Gui/3Dconnexion/navlib/NavlibPivot.cpp

@@ -109,6 +109,8 @@ long NavlibInterface::SetPivotVisible(bool visible)
     return 0;
 }
 
+extern template SoCamera* NavlibInterface::getCamera<SoCamera*>() const;
+
 long NavlibInterface::GetHitLookAt(navlib::point_t& position) const
 {
     if (is2DView())