Sketcher: OCC checks for knot functionality

src/Mod/Sketcher/App/Sketch.cpp

@@ -27,6 +27,7 @@
 # include <Precision.hxx>
 # include <ShapeFix_Wire.hxx>
 # include <TopoDS_Compound.hxx>
+# include <Standard_Version.hxx>
 #endif
 
 #include <Base/Writer.h>
@@ -2704,6 +2705,7 @@ bool Sketch::updateGeometry()
 
                 bsp->setKnots(knots,mult);
                 
+                #if OCC_VERSION_HEX >= 0x060900
                 int index = 0;
                 for(std::vector<int>::const_iterator it5 = mybsp.knotpointGeoids.begin(); it5 != mybsp.knotpointGeoids.end(); ++it5, index++) {
                     if( *it5 != Constraint::GeoUndef) {
@@ -2716,6 +2718,7 @@ bool Sketch::updateGeometry()
                         }
                     }
                 }
+                #endif
 
             }
         } catch (Base::Exception e) {