There has been a lot of problem to compile VTK and wxWindows together. I tried
to sum up all possible (=reported) problems in this README file.

Under VC++6 there are some tricks to know:
-------------------------------------------

Q1. Under Win32, don't call vtkRenderer::Delete();
I didn't had time to explore this:
http://www.vtk.org/pipermail/vtkusers/2003-September/019894.html


Q2. Linkage has to be consistent. The class has been succesfully built with 
there four cases:

                     VTK static     VTK dynamic
wxWindows static        1                3
wxWindows dynamic       2                4

Just open the file: wxVTKRenderWindowInteractor.h, find the line:
class VTK_RENDERING_EXPORT wxVTKRenderWindowInteractor : public wxWindow, public vtkRenderWindowInteractor
      ^^^^^^^^^^^^^^^^^^^^
And change it accordingly

  1. VTK_RENDERING_EXPORT is ok
  2. VTK_RENDERING_EXPORT is ok
  3. WXDLLEXPORT is ok
  4. remove WXDLLEXPORT / VTK_RENDERING_EXPORT
  

Q3. I want to link wxWindows as shared and I am getting tons of linkage error:

Sample.obj : error LNK2001: unresolved external symbol "protected: static struct wxEventTable const  wxFrame::sm_eventTable" (?sm_eventTable@wxFrame@@1UwxEventTable@@B)
Sample.obj : error LNK2001: unresolved external symbol "int const  wxEVT_NULL" (?wxEVT_NULL@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_NULL" (?wxEVT_NULL@@3HB)
Sample.obj : error LNK2001: unresolved external symbol "int const  wxEVT_COMMAND_MENU_SELECTED" (?wxEVT_COMMAND_MENU_SELECTED@@3HB)
Sample.obj : error LNK2001: unresolved external symbol "class wxWindowList  wxTopLevelWindows" (?wxTopLevelWindows@@3VwxWindowList@@A)
Sample.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxApp::sm_classwxApp" (?sm_classwxApp@wxApp@@2VwxClassInfo@@A)
Sample.obj : error LNK2001: unresolved external symbol "protected: static class wxApp * (__cdecl* wxAppBase::m_appInitFn)(void)" (?m_appInitFn@wxAppBase@@1P6APAVwxApp@@XZA)
Sample.obj : error LNK2001: unresolved external symbol "class wxApp *  wxTheApp" (?wxTheApp@@3PAVwxApp@@A)
Sample.obj : error LNK2001: unresolved external symbol "class wxPoint const  wxDefaultPosition" (?wxDefaultPosition@@3VwxPoint@@B)
Sample.obj : error LNK2001: unresolved external symbol "class wxSize const  wxDefaultSize" (?wxDefaultSize@@3VwxSize@@B)
Sample.obj : error LNK2001: unresolved external symbol "char const * const  wxPanelNameStr" (?wxPanelNameStr@@3PBDB)
Sample.obj : error LNK2001: unresolved external symbol "char const * const  wxStatusLineNameStr" (?wxStatusLineNameStr@@3PBDB)
Sample.obj : error LNK2001: unresolved external symbol "char const * const  wxFrameNameStr" (?wxFrameNameStr@@3PBDB)
Sample.obj : error LNK2001: unresolved external symbol "char const * const  wxEmptyString" (?wxEmptyString@@3PBDB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "char const * const  wxEmptyString" (?wxEmptyString@@3PBDB)
Sample.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxFrame::sm_classwxFrame" (?sm_classwxFrame@wxFrame@@2VwxClassInfo@@A)
Sample.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxEvtHandler::sm_classwxEvtHandler" (?sm_classwxEvtHandler@wxEvtHandler@@2VwxClassInfo@@A)
Sample.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxObject::sm_classwxObject" (?sm_classwxObject@wxObject@@2VwxClassInfo@@A)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxObject::sm_classwxObject" (?sm_classwxObject@wxObject@@2VwxClassInfo@@A)
Sample.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxMenu::sm_classwxMenu" (?sm_classwxMenu@wxMenu@@2VwxClassInfo@@A)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "protected: static struct wxEventTable const  wxWindow::sm_eventTable" (?sm_eventTable@wxWindow@@1UwxEventTable@@B)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo *  wxClassInfo::sm_first" (?sm_first@wxClassInfo@@2PAV1@A)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_SIZE" (?wxEVT_SIZE@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_TIMER" (?wxEVT_TIMER@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_KEY_UP" (?wxEVT_KEY_UP@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_CHAR" (?wxEVT_CHAR@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_LEAVE_WINDOW" (?wxEVT_LEAVE_WINDOW@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_ENTER_WINDOW" (?wxEVT_ENTER_WINDOW@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_RIGHT_UP" (?wxEVT_RIGHT_UP@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_MIDDLE_UP" (?wxEVT_MIDDLE_UP@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_LEFT_UP" (?wxEVT_LEFT_UP@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_RIGHT_DOWN" (?wxEVT_RIGHT_DOWN@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_MIDDLE_DOWN" (?wxEVT_MIDDLE_DOWN@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_LEFT_DOWN" (?wxEVT_LEFT_DOWN@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_MOTION" (?wxEVT_MOTION@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_ERASE_BACKGROUND" (?wxEVT_ERASE_BACKGROUND@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "int const  wxEVT_PAINT" (?wxEVT_PAINT@@3HB)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxFont::sm_classwxFont" (?sm_classwxFont@wxFont@@2VwxClassInfo@@A)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxGDIObject::sm_classwxGDIObject" (?sm_classwxGDIObject@wxGDIObject@@2VwxClassInfo@@A)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxWindowBase::sm_classwxWindowBase" (?sm_classwxWindowBase@wxWindowBase@@2VwxClassInfo@@A)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxWindow::sm_classwxWindow" (?sm_classwxWindow@wxWindow@@2VwxClassInfo@@A)
wxVTKRenderWindowInteractor.obj : error LNK2001: unresolved external symbol "public: static class wxClassInfo  wxTimer::sm_classwxTimer" (?sm_classwxTimer@wxTimer@@2VwxClassInfo@@A)
MSVCRT.lib(crtexew.obj) : error LNK2001: unresolved external symbol _WinMain@16
Release/Sample.exe : fatal error LNK1120: 40 unresolved externals
Error executing link.exe.


  In this case you have to add manually in VC++6/Settings/Preprocessor options:

      WXUSINGDLL=1
  Please refer to: http://www.cmake.org/pipermail/cmake/2003-September/004263.html
  to check if a better solution has been found.


Q4. I compiled VTK with DEBUG_LEAK=ON and I get:

Generic Warning: In /home/malat/Kitware/VTK/Common/vtkDebugLeaks.cxx, line 280
Deleting unknown object: wxVTKRenderWindowInteractor

  That's ok it is just that we are not registered.
  Keep in mind to not delete explicitely a wxVTKRenderWindow instance:
  don't use:

                            delete m_WXRWI
                            
  but instead use (just as any other VTK object):

                          m_WXRWI->Delete();
  

Q5. What's is this Modules directory ?
    This is mainly for historical reason, when cmake was not so well integrated
    with wxWindows.
    As of 10/16/2005. CMake does not provide good Find* modules, I am now shipping them.


Q6. What are the OS supported ? 
    I have personally tested it under Win32, Mac(Carbon/Cocoa) and Linux(gtk1, gtk2).
    I have been reported that it works under :
      - Unix, 
      - HP-UX
      - From a win box (win2k) using Exceed as Xserver
  

Q7. Which VTK version is supported ?
    VTK 3.1, VTK 3.2, VTK 4.0, VTK 4.2, VTK 4.4, VTK 5.0 and VTK CVS !!
    
Q8. Which wxWidgets version is supported ?
    wxWindows 2.4.2 and wxWidgets 2.6.2 are the two only tested wx version tested. Some other could work but see web page about broken 2.4.0 and 2.4.1

Q9. I am getting some very weird linking errors on Mac and wx 2.6.2, what should I do:
    Building executable /Users/mathieu/Projects/Write/wxVTK-carbon/wxImagePlaneWidget.app/Contents/MacOS/wxImagePlaneWidget...
    ld: src/wxVTKRenderWindowInteractor.o illegal reference to symbol: _wxEVT_CHAR defined in indirectly referenced dynamic library /Users/mathieu/Projects/wxWidgets-2.6.2/install-carbon/lib/libwx_mac_core-2.6.0.dylib
    ld: Sample/wxImagePlaneWidget.o illegal reference to symbol: wxAppConsole::HandleEvent(wxEvtHandler*, void (wxEvtHandler::*)(wxEvent&), wxEvent&) const defined in indirectly referenced dynamic library /Users/mathieu/Projects/wxWidgets-2.6.2/install-carbon/lib/libwx_base_carbon-2.6.0.dylib
    ld: warning suggest use of -bind_at_load, as lazy binding may result in errors or different symbols being used
    symbol __TIFFBuiltinCODECS used from dynamic library /Users/mathieu/Projects/wxWidgets-2.6.2/install-carbon/lib/libwx_mac_core-2.6.0.dylib(single module) not from earlier dynamic library /Users/mathieu/Dashboards/MyTests/VTK-carbon-gcc/bin/libvtktiff.dylib(tif_codec.o)
    make[1]: *** [/Users/mathieu/Projects/Write/wxVTK-carbon/wxImagePlaneWidget.app/Contents/MacOS/wxImagePlaneWidget] Error 1
    make: *** [default_target] Error 2

    -> The only way I found that work, is to build using the option `monolithic`
    $ ../configure --with-cocoa --disable-compat24 --prefix=/Users/mathieu/Projects/wxWidgets-2.6.2/install-cocoa --enable-monolithic
    and
    $ ../configure --with-mac --disable-compat24 --prefix=/Users/mathieu/Projects/wxWidgets-2.6.2/install-carbon --enable-monolithic

Q10. I am getting some very weird linking errors on Linux/gcc4 and wx 2.4.2, what should I do:
     ...gtk2/lib/libwx_gtk2-2.4.so: undefined reference to `wxwxListStringNode::~wxwxListStringNode()'
     ...gtk2/lib/libwx_gtk2-2.4.so: undefined reference to `wxwxMenuItemListNode::~wxwxMenuItemListNode()'
     ...gtk2/lib/libwx_gtk2-2.4.so: undefined reference to `wxwxMenuItemListNode::~wxwxMenuItemListNode()'
     ...gtk2/lib/libwx_gtk2-2.4.so: undefined reference to `vtable for wxFileProto'
     ...gtk2/lib/libwx_gtk2-2.4.so: undefined reference to `wxwxListStringNode::~wxwxListStringNode()'

     Sorry I have no time to investigate, feel free to bug wxWidgets team, but the bug is fairly known:
     [Bug 154958 - wxGTK is not building properly with gcc4]
     https://bugzilla.redhat.com/bugzilla/long_list.cgi?buglist=154958

Q11. How do I set /MT for building wxMSW ?
  According to: http://wiki.wxwidgets.org/Compiling_WxWidgets#wxWidgets_Library_2
  You need to set the flag to everything single subprojects. Yes you read it right, you are required to have access to the compiler to the target machine (no ssh for example), but you have to *manually* do it (painful).
