diff --git a/libsrc/visualization/CMakeLists.txt b/libsrc/visualization/CMakeLists.txt
index 9ddd9dbd..d1b8b184 100644
--- a/libsrc/visualization/CMakeLists.txt
+++ b/libsrc/visualization/CMakeLists.txt
@@ -7,7 +7,7 @@ target_sources(nggui PRIVATE
     vssolution.cpp
     visualpkg.cpp
 )
-target_link_libraries( nggui PUBLIC "$<BUILD_INTERFACE:netgen_python>" ${MPI_CXX_LIBRARIES} ${OPENGL_LIBRARIES} )
+target_link_libraries( nggui PUBLIC "$<BUILD_INTERFACE:netgen_python>" ${MPI_CXX_LIBRARIES} ${OPENGL_LIBRARIES} nglib)
 
 install(FILES
   meshdoc.hpp mvdraw.hpp visual_api.hpp
diff --git a/libsrc/visualization/visualpkg.cpp b/libsrc/visualization/visualpkg.cpp
index 4128de74..11881159 100644
--- a/libsrc/visualization/visualpkg.cpp
+++ b/libsrc/visualization/visualpkg.cpp
@@ -377,7 +377,7 @@ namespace netgen
   }
 
   VisualSceneMeshDoctor vsmeshdoc;
-  DLL_HEADER shared_ptr<Mesh> mesh;
+  DLL_HEADER extern shared_ptr<Mesh> mesh;
 
   int Ng_MeshDoctor(ClientData clientData,
 	  Tcl_Interp * interp,