Doesn't build with FOX17:

---
In file included from /wrkdirs/usr/ports/x11-toolkits/vtkfox/work/gahr-vtkfox-378836c/src/FXVTKCanvas.cpp:9:
In file included from /wrkdirs/usr/ports/x11-toolkits/vtkfox/work/gahr-vtkfox-378836c/src/vtkFXRenderWindowInteractor.h:16:
In file included from /usr/local/include/vtk-5.10/vtkRenderWindowInteractor.h:45:
In file included from /usr/local/include/vtk-5.10/vtkObject.h:41:
In file included from /usr/local/include/vtk-5.10/vtkObjectBase.h:43:
In file included from /usr/local/include/vtk-5.10/vtkIndent.h:24:
In file included from /usr/local/include/vtk-5.10/vtkSystemIncludes.h:40:
In file included from /usr/local/include/vtk-5.10/vtkIOStream.h:35:
In file included from /usr/include/c++/v1/iostream:38:
In file included from /usr/include/c++/v1/ios:216:
In file included from /usr/include/c++/v1/__locale:15:
/usr/include/c++/v1/string:1619:47: error: use of undeclared identifier '__alignment'
                 __align<sizeof(value_type) < __alignment ?
                                              ^
/usr/include/c++/v1/string:1620:29: error: use of undeclared identifier '__alignment'
                            __alignment/sizeof(value_type) : 1 > (__s+1)) - 1;}
                            ^
/usr/include/c++/v1/string:2107:46: error: use of undeclared identifier '__alignment'
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
                                             ^
/usr/include/c++/v1/string:2139:46: error: use of undeclared identifier '__alignment'
    size_type __cap = __old_cap < __ms / 2 - __alignment ?
                                             ^
---

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