+ raise error message when trying to mesh without netgen support

src/Mod/Fem/Gui/ViewProviderFemMeshShapeNetgen.cpp

@@ -25,12 +25,14 @@
 
 #ifndef _PreComp_
 # include <Standard_math.hxx>
+# include <QCoreApplication>
 #endif
 
 #include "ViewProviderFemMeshShapeNetgen.h"
 #include "TaskDlgMeshShapeNetgen.h"
 
-#include "Gui/Control.h"
+#include <Gui/Control.h>
+#include <Gui/MainWindow.h>
 
 
 using namespace FemGui;
@@ -38,6 +40,8 @@ using namespace FemGui;
 
 
 
+/* TRANSLATOR FemGui::ViewProviderFemMeshShapeNetgen */
+
 PROPERTY_SOURCE(FemGui::ViewProviderFemMeshShapeNetgen, FemGui::ViewProviderFemMeshShape)
 
 
@@ -63,10 +67,16 @@ bool ViewProviderFemMeshShapeNetgen::setEdit(int ModNum)
     if (ModNum == ViewProvider::Default) {
         // clear the selection (convenience)
         Gui::Selection().clearSelection();
-
+#ifdef FCWithNetgen
         Gui::Control().showDialog(new TaskDlgMeshShapeNetgen(this));
-
         return true;
+#else
+        QMessageBox::critical(Gui::getMainWindow(),
+            QCoreApplication::translate("FemGui::ViewProviderFemMeshShapeNetgen", "Meshing failure"),
+            QCoreApplication::translate("FemGui::ViewProviderFemMeshShapeNetgen", "The FEM module is built without NETGEN support. Meshing will not work!!!")
+        );
+        return false;
+#endif
     }
     else {
         return ViewProviderDocumentObject::setEdit(ModNum);