diff --git a/TIGLViewer/src/TIGLAISTriangulation.cpp b/TIGLViewer/src/TIGLAISTriangulation.cpp
index 252c2e9ab..479e0ae16 100755
--- a/TIGLViewer/src/TIGLAISTriangulation.cpp
+++ b/TIGLViewer/src/TIGLAISTriangulation.cpp
@@ -119,22 +119,21 @@ void TIGLAISTriangulation::Compute(const Handle(PrsMgr_PresentationManager3d)& a
                         );
 
 
-            gp_Vec3f aNormal;
             if (hasVNormals) {
                 if (hasVColors) {
                     const TColStd_Array1OfInteger& colors = myColor->Array1();
                     for (int i = 1; i <= myTriangulation->NbNodes(); i++ ) {
                         anArray->AddVertex(myTriangulation->Node(i), AttenuateColor(colors(i), ambient));
-                        myTriangulation->Normal(i, aNormal);
-                        anArray->SetVertexNormal(i, aNormal.x(), aNormal.y(), aNormal.z());
+                        auto aNormal = myTriangulation->Normal(i);
+                        anArray->SetVertexNormal(i, aNormal.X(), aNormal.Y(), aNormal.Z());
                     }
                 }
                 // !hasVColors
                 else {
                     for (int i = 1; i <= myTriangulation->NbNodes(); i++ ) {
                         anArray->AddVertex(myTriangulation->Node(i));
-                        myTriangulation->Normal(i, aNormal);
-                        anArray->SetVertexNormal(i, aNormal.x(), aNormal.y(), aNormal.z());
+                        auto aNormal = myTriangulation->Normal(i);
+                        anArray->SetVertexNormal(i, aNormal.X(), aNormal.Y(), aNormal.Z());
 
                     }
                 }
diff --git a/src/common/tiglcommonfunctions.cpp b/src/common/tiglcommonfunctions.cpp
index fb0827b3c..4a8098d5c 100644
--- a/src/common/tiglcommonfunctions.cpp
+++ b/src/common/tiglcommonfunctions.cpp
@@ -58,7 +58,13 @@
 #include "TopTools_IndexedMapOfShape.hxx"
 #include "TopTools_HSequenceOfShape.hxx"
 #include "GeomAdaptor_Curve.hxx"
+
+#if OCC_VERSION_HEX >= VERSION_HEX_CODE(7,6,0)
 #include "BRepAdaptor_CompCurve.hxx"
+#else
+#include "BRepAdaptor_HCompCurve.hxx"
+#endif
+
 #include "BRepAdaptor_Curve.hxx"
 #include "GCPnts_AbscissaPoint.hxx"
 #include "BRep_Builder.hxx"
@@ -1102,8 +1108,13 @@ TopoDS_Face BuildRuledFace(const TopoDS_Wire& wire1, const TopoDS_Wire& wire2)
 
     // Wrap the adaptor in a class which manages curve access via handle (HCurve). According to doxygen
     // this is required by the algorithms
+#if OCC_VERSION_HEX >= VERSION_HEX_CODE(7,6,0)
     const Handle(Adaptor3d_Curve) curve1 = new BRepAdaptor_CompCurve(compCurve1);
     const Handle(Adaptor3d_Curve) curve2 = new BRepAdaptor_CompCurve(compCurve2);
+#else
+    Handle(Adaptor3d_HCurve) curve1 = new BRepAdaptor_HCompCurve(compCurve1);
+    Handle(Adaptor3d_HCurve) curve2 = new BRepAdaptor_HCompCurve(compCurve2);
+#endif
 
     // We have to generate an approximated curve now from the wire using the adaptor
     // NOTE: last parameter value unknown