- Compilation errors on Linux were corrected.
- TKIVtk is not generated and built if VTK prerequisite is not found.
- Got rid of warnings in TKIVtk. style corrections.

+//  IShape : Interface for working with a shape and its sub-shapes ids.
+//  File   : IVtk_IShape.h
+//  Author : Roman KOZLOV
+//  Module : IVtk
+//  $Header: $

+#include "IVtk_Interface.hxx"
+#include "IVtk_Types.hxx"

+//! @class IVtk_IShape 
+//! @brief Interface for working with a shape and its sub-shapes ids.
+//! @ingroup interfaces
...
+//! @defgroup occimpl IVtkOCC

+  Standard_EXPORT IVtk_IdType GetId() const { return myId; }
+
+  Standard_EXPORT void SetId (IVtk_IdType theId) { myId = theId; }

+  if (!(theShape.IsNull()))
+  {
...
+  if (!(thePointIds->IsEmpty()))
+  {

+class IVtk_IShapePickerAlgo : public IVtk_Interface
+{
...
+  Standard_EXPORT virtual void SetView (IVtk_IView::Handle& theView) = 0;

+  Standard_EXPORT virtual bool Pick (const double& theX, const double& theY) = 0;
+  Standard_EXPORT virtual bool Pick (const double& theXMin,
+                                     const double& theYMin,
+                                     const double& theXMax,
+                                     const double& theYMax) = 0;

+  //! @return the list of picked top-level shape IDs,
+  //! in the order of increasing depth (the ID of the shape closest to the eye 
+  //! is the first in the list)
+  Standard_EXPORT virtual IVtk_ShapeIdList ShapesPicked () const;
+
+  //! @param [in] theId Top-level shape ID
+  //! @return the list of picked sub-shape IDs for the given top-level shape ID,
+  //! in the order of increasing depth (the ID of the sub-shape closest to the eye 
+  //! is the first in the list)
+  Standard_EXPORT virtual IVtk_ShapeIdList SubShapesPicked (const IVtk_IdType theId) const;

+  //! Converts 3D display coordinates into 3D world coordinates.
+  //! @param [in] theDisplayPnt array of two double display coordinates
+  //! @param [out] theWorldPnt array of three double world coordinates (memory should be allocated by the caller!)
+  //! @return true if conversion was successful, false otherwise
+  Standard_EXPORT virtual bool    DisplayToWorld (double* theDisplayPnt, double* theWorldPnt) const = 0;

+class IVtk_Interface : public MMgt_TShared

+struct IVtk_Pnt2d
+{
+  double x;
+  double y;
+};

+#ifndef IVtkOCC_H
+#define IVtkOCC_H
+
+//! @defgroup occimpl IVtkOCC
+
+#define qDebug() cout
...
+        qDebug() << "Error: EntityOwner having null SelectableObject picked!";

+IVtkOCC_SelectableObject::IVtkOCC_SelectableObject (const IVtkOCC_Shape::Handle& theShape)
+: SelectMgr_SelectableObject (PrsMgr_TOP_AllView),
+  myShape (theShape)
+{
+  if (myShape)
+  {
+    myShape->SetSelectableObject (this);
+  }

+const TopoDS_Shape& IVtkOCC_Shape::GetSubShape (const IVtk_IdType theId) const
+{
+  if (theId < 0)
+  {
+    return myTopoDSShape;
+  }

+
+IVtkOCC_Shape::IVtkOCC_Shape (const TopoDS_Shape& theShape)
+: myTopoDSShape (theShape)
+{
+  buildSubShapeIdMap();
+}
+
+IVtkOCC_Shape::~IVtkOCC_Shape() { }

+Standard_Real IVtkOCC_ShapeMesher::GetDeflection() const
+{
+  if (myDeflection == 0.0)
...
+void IVtkOCC_ShapeMesher::meshShape()
+{
+  Standard_Real aDeflection = GetDeflection();
+  if (aDeflection == 0.0)
+  {
+    return;
+  }
...
+void IVtkOCC_ShapeMesher::addWireFrameFaces()
+{
+  // Check the deflection value once for all faces
+  if (GetDeflection() == 0.0)
+  {
+    return;
+  }

+      IVtkOCC_ShapeMesher* aThisMesher = const_cast<IVtkOCC_ShapeMesher*> (this);

+      // This magic line comes from AIS_Shape.cxx in OCCT 6.5.1
+      aThisMesher->myDeflection = Max (aMaxX - aMinX, Max (aMaxY - aMinY, aMaxZ - aMinZ) )
+                                  * GetDeviationCoeff() * 4;

+    // Enable parallel mode of meshing if required
+    Standard_Boolean wasParallel = BRepMesh_IncrementalMesh::IsParallelDefault();
+    if ( myIsParallel && !wasParallel )
+    {
+      BRepMesh_IncrementalMesh::SetParallelDefault(Standard_True);
+    }

+void IVtkOCC_ShapeMesher::processPolyline (Standard_Integer          theNbNodes,
+                                      const TColgp_Array1OfPnt&      thePoints,
+                                      const TColStd_Array1OfInteger& thePointIds,
+                                      const IVtk_IdType              theOcctId,
+                                      bool                           theNoTransform,
+                                      gp_Trsf                        theTransformation,
+                                      const IVtk_MeshType            theMeshType)
+{
+  if (theNbNodes < 2)
+  {
+    return;
+  }
+
+  IVtk_PointIdList *aPolyPointIds = new IVtk_PointIdList();

+DEFINE_BASECOLLECTION(OccPolylinesBase,
+                      TColgp_SequenceOfPnt)
+DEFINE_LIST          (OccPolylines,
+                      OccPolylinesBase,
+                      TColgp_SequenceOfPnt)

+  void PrintSelf (ostream& theOs, vtkIndent theIndent);

+class Standard_EXPORT IVtkTools_ShapeDataSource : public vtkPolyDataAlgorithm
+class Standard_EXPORT IVtkTools_ShapeObject :  public vtkDataObject
+class Standard_EXPORT IVtkTools_SubPolyDataFilter : public vtkPolyDataAlgorithm