diff --git a/libsrc/meshing/global.hpp b/libsrc/meshing/global.hpp
index 776fd93a..e6cb59de 100644
--- a/libsrc/meshing/global.hpp
+++ b/libsrc/meshing/global.hpp
@@ -31,7 +31,7 @@ namespace netgen
 
   DLL_HEADER extern mutex tcl_todo_mutex;
 
-  class multithreadt
+  class DLL_HEADER multithreadt
   {
   public:
     int pause;
diff --git a/libsrc/meshing/meshclass.hpp b/libsrc/meshing/meshclass.hpp
index 4ca5b648..70cf0c02 100644
--- a/libsrc/meshing/meshclass.hpp
+++ b/libsrc/meshing/meshclass.hpp
@@ -334,7 +334,7 @@ namespace netgen
     const auto & LockedPoints() const { return lockedpoints; }
 
     /// Returns number of domains
-    int GetNDomains() const;
+    DLL_HEADER int GetNDomains() const;
     ///
     int GetDimension() const { return dimension; }
     void SetDimension (int dim) { dimension = dim; }
@@ -416,7 +416,7 @@ namespace netgen
     ///
 	DLL_HEADER void SetMaxHDomain (const Array<double> & mhd);
     ///
-    double GetH (const Point3d & p) const;
+    DLL_HEADER double GetH (const Point3d & p) const;
     ///
     double GetMinH (const Point3d & pmin, const Point3d & pmax);
     ///
diff --git a/libsrc/meshing/meshtype.hpp b/libsrc/meshing/meshtype.hpp
index 04be6d0c..f3446192 100644
--- a/libsrc/meshing/meshtype.hpp
+++ b/libsrc/meshing/meshtype.hpp
@@ -698,7 +698,7 @@ namespace netgen
     /// Calculates Volume of elemenet
     double Volume (const T_POINTS & points) const;
     ///
-    void Print (ostream & ost) const;
+    DLL_HEADER void Print (ostream & ost) const;
     ///
     int GetNFaces () const
     {
@@ -1388,7 +1388,7 @@ namespace netgen
     /// remove secondorder
     void SetMaxPointNr (int maxpnum);
 
-    void Print (ostream & ost) const;
+    DLL_HEADER void Print (ostream & ost) const;
   };
 
 
diff --git a/libsrc/occ/Partition_Inter2d.hxx b/libsrc/occ/Partition_Inter2d.hxx
index cfd4a9ac..c018bacb 100644
--- a/libsrc/occ/Partition_Inter2d.hxx
+++ b/libsrc/occ/Partition_Inter2d.hxx
@@ -27,9 +27,19 @@
 #ifndef _Partition_Inter2d_HeaderFile
 #define _Partition_Inter2d_HeaderFile
 
-#ifndef _Handle_BRepAlgo_AsDes_HeaderFile
-#include <Handle_BRepAlgo_AsDes.hxx>
+#ifndef _Standard_Version_HeaderFile
+   #include <Standard_Version.hxx>
 #endif
+
+#if OCC_VERSION_HEX < 0x070000
+   #ifndef _Handle_BRepAlgo_AsDes_HeaderFile
+      #include <Handle_BRepAlgo_AsDes.hxx>
+   #endif
+#else
+   #include <BRepAlgo_AsDes.hxx>
+   #include <TopTools_MapOfShape.hxx>
+#endif
+
 #ifndef _Standard_Real_HeaderFile
 #include <Standard_Real.hxx>
 #endif
@@ -38,9 +48,13 @@
 #endif
 class BRepAlgo_AsDes;
 class TopoDS_Face;
-class TopTools_MapOfShape;
+
+#if OCC_VERSION_HEX < 0x070000
+   class TopTools_MapOfShape;
+   class TopTools_ListOfShape;
+#endif
+
 class TopoDS_Vertex;
-class TopTools_ListOfShape;
 class TopoDS_Edge;
 
 
diff --git a/libsrc/occ/Partition_Inter3d.hxx b/libsrc/occ/Partition_Inter3d.hxx
index d8be2c59..93af0773 100644
--- a/libsrc/occ/Partition_Inter3d.hxx
+++ b/libsrc/occ/Partition_Inter3d.hxx
@@ -27,8 +27,17 @@
 #ifndef _Partition_Inter3d_HeaderFile
 #define _Partition_Inter3d_HeaderFile
 
-#ifndef _Handle_BRepAlgo_AsDes_HeaderFile
-#include <Handle_BRepAlgo_AsDes.hxx>
+#ifndef _Standard_Version_HeaderFile
+#include <Standard_Version.hxx>
+#endif
+
+#if OCC_VERSION_HEX < 0x070000
+   #ifndef _Handle_BRepAlgo_AsDes_HeaderFile
+      #include <Handle_BRepAlgo_AsDes.hxx>
+   #endif
+#else
+   #include <BRepAlgo_AsDes.hxx>
+   #include <TopTools_DataMapOfShapeShape.hxx>
 #endif
 #ifndef _TopTools_DataMapOfShapeListOfShape_HeaderFile
 #include <TopTools_DataMapOfShapeListOfShape.hxx>
@@ -42,11 +51,15 @@
 #ifndef _Standard_Boolean_HeaderFile
 #include <Standard_Boolean.hxx>
 #endif
+
+#if OCC_VERSION_HEX < 0x070000
+   class TopTools_ListOfShape;
+   class TopTools_DataMapOfShapeShape;
+   class TopTools_MapOfShape;
+#endif
+
 class BRepAlgo_AsDes;
-class TopTools_ListOfShape;
-class TopTools_DataMapOfShapeShape;
 class TopoDS_Face;
-class TopTools_MapOfShape;
 class TopoDS_Shape;
 class TopoDS_Vertex;
 class TopoDS_Edge;
diff --git a/libsrc/occ/Partition_Loop.hxx b/libsrc/occ/Partition_Loop.hxx
index 56e05e26..94cdfa38 100644
--- a/libsrc/occ/Partition_Loop.hxx
+++ b/libsrc/occ/Partition_Loop.hxx
@@ -36,9 +36,14 @@
 #ifndef _TopTools_DataMapOfShapeListOfShape_HeaderFile
 #include <TopTools_DataMapOfShapeListOfShape.hxx>
 #endif
+#ifndef _Standard_Version_HeaderFile
+#include <Standard_Version.hxx>
+#endif
 class TopoDS_Face;
 class TopoDS_Edge;
-class TopTools_ListOfShape;
+#if OCC_VERSION_HEX < 0x070000
+   class TopTools_ListOfShape;
+#endif
 
 
 #ifndef _Standard_HeaderFile
diff --git a/libsrc/occ/Partition_Loop2d.cxx b/libsrc/occ/Partition_Loop2d.cxx
index 81e484c9..1baf1528 100644
--- a/libsrc/occ/Partition_Loop2d.cxx
+++ b/libsrc/occ/Partition_Loop2d.cxx
@@ -52,6 +52,8 @@
 #include <gp_Pnt.hxx>
 #include <gp_Pnt2d.hxx>
 
+#define PI 3.14159265358979323846
+
 //=======================================================================
 //function : Partition_Loop2d
 //purpose  :
diff --git a/libsrc/occ/Partition_Loop2d.hxx b/libsrc/occ/Partition_Loop2d.hxx
index bdf1c253..d68c6c37 100644
--- a/libsrc/occ/Partition_Loop2d.hxx
+++ b/libsrc/occ/Partition_Loop2d.hxx
@@ -22,9 +22,16 @@
 #ifndef _TopTools_MapOfShape_HeaderFile
 #include <TopTools_MapOfShape.hxx>
 #endif
+#ifndef _Standard_Version_HeaderFile
+#include <Standard_Version.hxx>
+#endif
+
+
 class TopoDS_Face;
 class TopoDS_Edge;
-class TopTools_ListOfShape;
+#if OCC_VERSION_HEX < 0x070000
+   class TopTools_ListOfShape;
+#endif
 class BRepAlgo_Image;
 
 
diff --git a/libsrc/occ/Partition_Loop3d.hxx b/libsrc/occ/Partition_Loop3d.hxx
index 52abd115..e1716691 100644
--- a/libsrc/occ/Partition_Loop3d.hxx
+++ b/libsrc/occ/Partition_Loop3d.hxx
@@ -22,9 +22,24 @@
 #ifndef _Standard_Real_HeaderFile
 #include <Standard_Real.hxx>
 #endif
+#ifndef _Standard_Version_HeaderFile
+#include <Standard_Version.hxx>
+#endif
+
+#if OCC_VERSION_HEX < 0x070000
+#else
+   #include <TopTools_ShapeMapHasher.hxx>
+   #include <TopTools_OrientedShapeMapHasher.hxx>
+   #include <TopTools_MapOfOrientedShape.hxx>
+#endif
+
 class TopoDS_Shape;
-class TopTools_ListOfShape;
-class TopTools_MapOfOrientedShape;
+
+#if OCC_VERSION_HEX < 0x070000
+   class TopTools_ListOfShape;
+   class TopTools_MapOfOrientedShape;
+#endif
+
 class TopoDS_Edge;
 class TopoDS_Face;
 class gp_Vec;
diff --git a/libsrc/occ/Partition_Spliter.hxx b/libsrc/occ/Partition_Spliter.hxx
index f29917a3..e75e9893 100644
--- a/libsrc/occ/Partition_Spliter.hxx
+++ b/libsrc/occ/Partition_Spliter.hxx
@@ -10,6 +10,10 @@
 #ifndef _Partition_Spliter_HeaderFile
 #define _Partition_Spliter_HeaderFile
 
+#ifndef _Standard_Version_HeaderFile
+#include <Standard_Version.hxx>
+#endif
+
 #ifndef _TopAbs_ShapeEnum_HeaderFile
 #include <TopAbs_ShapeEnum.hxx>
 #endif
@@ -28,9 +32,16 @@
 #ifndef _TopTools_DataMapOfShapeShape_HeaderFile
 #include <TopTools_DataMapOfShapeShape.hxx>
 #endif
-#ifndef _Handle_BRepAlgo_AsDes_HeaderFile
-#include <Handle_BRepAlgo_AsDes.hxx>
+
+#if OCC_VERSION_HEX < 0x070000
+   #ifndef _Handle_BRepAlgo_AsDes_HeaderFile
+      #include <Handle_BRepAlgo_AsDes.hxx>
+   #endif
+#else
+   #include <BRepAlgo_AsDes.hxx>
+   #include <TopTools_MapOfShape.hxx>
 #endif
+
 #ifndef _BRepAlgo_Image_HeaderFile
 #include <BRepAlgo_Image.hxx>
 #endif
@@ -45,7 +56,10 @@
 #endif
 class BRepAlgo_AsDes;
 class TopoDS_Shape;
-class TopTools_ListOfShape;
+
+#if OCC_VERSION_HEX < 0x070000
+   class TopTools_ListOfShape;
+#endif
 class TopoDS_Edge;
 
 
diff --git a/libsrc/occ/occgenmesh.cpp b/libsrc/occ/occgenmesh.cpp
index f0ca2501..1530a31e 100644
--- a/libsrc/occ/occgenmesh.cpp
+++ b/libsrc/occ/occgenmesh.cpp
@@ -18,7 +18,7 @@ namespace netgen
 #define VSMALL 1e-10
 
 
-   bool merge_solids = 1;
+   DLL_HEADER bool merge_solids = 1;
 
 
   // can you please explain what you intend to compute here (JS) !!!
diff --git a/libsrc/occ/occgeom.cpp b/libsrc/occ/occgeom.cpp
index 1a6b8a46..3ffaf376 100644
--- a/libsrc/occ/occgeom.cpp
+++ b/libsrc/occ/occgeom.cpp
@@ -8,14 +8,24 @@
 #include "ShapeAnalysis_CheckSmallFace.hxx"
 #include "ShapeAnalysis_DataMapOfShapeListOfReal.hxx"
 #include "ShapeAnalysis_Surface.hxx"
-#include "BRepAlgoAPI_Fuse.hxx"
+
 #include "BRepCheck_Analyzer.hxx"
 #include "BRepLib.hxx"
 #include "ShapeBuild_ReShape.hxx"
 #include "ShapeFix.hxx"
 #include "ShapeFix_FixSmallFace.hxx"
 #include "Partition_Spliter.hxx"
+#include "BRepAlgoAPI_Fuse.hxx"
 
+#ifndef _Standard_Version_HeaderFile
+#include <Standard_Version.hxx>
+#endif
+
+#if OCC_VERSION_HEX < 0x070000
+#else
+   #include "StlTransfer.hxx"
+   #include "TopoDS_Iterator.hxx"
+#endif
 
 namespace netgen
 {
@@ -938,7 +948,11 @@ namespace netgen
    void OCCGeometry :: CalcBoundingBox ()
    {
       Bnd_Box bb;
+#if OCC_VERSION_HEX < 0x070000
       BRepBndLib::Add (shape, bb);
+#else
+      BRepBndLib::Add ((const TopoDS_Shape) shape, bb,(Standard_Boolean)true);
+#endif
 
       double x1,y1,z1,x2,y2,z2;
       bb.Get (x1,y1,z1,x2,y2,z2);
diff --git a/libsrc/occ/occgeom.hpp b/libsrc/occ/occgeom.hpp
index ca74b5b0..d77c8b85 100644
--- a/libsrc/occ/occgeom.hpp
+++ b/libsrc/occ/occgeom.hpp
@@ -394,7 +394,7 @@ namespace netgen
 
 
 
-   class OCCParameters
+   class DLL_HEADER OCCParameters
    {
    public:
 
@@ -443,11 +443,11 @@ namespace netgen
    extern int OCCGenerateMesh (OCCGeometry & occgeometry, shared_ptr<Mesh> & mesh,
 			       MeshingParameters & mparam);
 
-  extern void OCCSetLocalMeshSize(OCCGeometry & geom, Mesh & mesh);
+   DLL_HEADER extern void OCCSetLocalMeshSize(OCCGeometry & geom, Mesh & mesh);
 
-   extern void OCCMeshSurface (OCCGeometry & geom, Mesh & mesh, int perfstepsend);
+   DLL_HEADER extern void OCCMeshSurface (OCCGeometry & geom, Mesh & mesh, int perfstepsend);
 
-   extern void OCCFindEdges (OCCGeometry & geom, Mesh & mesh);
+   DLL_HEADER extern void OCCFindEdges (OCCGeometry & geom, Mesh & mesh);
 }
 
 #endif