IF(APPLE)
  SET(CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_C_CREATE_SHARED_LIBRARY}")
  SET(CMAKE_CXX_CREATE_SHARED_MODULE "${CMAKE_C_CREATE_SHARED_MODULE}")
  STRING( REGEX REPLACE "CMAKE_C_COMPILER" CMAKE_CXX_COMPILER CMAKE_CXX_CREATE_SHARED_MODULE "${CMAKE_CXX_CREATE_SHARED_MODULE}")
  STRING( REGEX REPLACE "CMAKE_C_COMPILER" CMAKE_CXX_COMPILER CMAKE_CXX_CREATE_SHARED_LIBRARY "${CMAKE_CXX_CREATE_SHARED_LIBRARY}")
ENDIF(APPLE)

SET(VTKFTGL_BINARY_DIR "${VTK_BINARY_DIR}/Utilities/ftgl" CACHE INTERNAL "")
SET(VTKFREETYPE_BINARY_DIR "${VTK_BINARY_DIR}/Utilities/freetype" CACHE INTERNAL "")
SET(VTKFTGL_SOURCE_DIR "${VTK_SOURCE_DIR}/Utilities/ftgl" CACHE INTERNAL "")
SET(VTKFREETYPE_SOURCE_DIR "${VTK_SOURCE_DIR}/Utilities/freetype" CACHE INTERNAL "")

SET(VTK_GLEXT_FILE "${VTK_SOURCE_DIR}/Utilities/ParseOGLExt/headers/glext.h" CACHE FILEPATH 
  "Location of the OpenGL extensions header file (glext.h).")
SET(VTK_GLXEXT_FILE "${VTK_SOURCE_DIR}/Utilities/ParseOGLExt/headers/glxext.h" CACHE FILEPATH
  "Location of the GLX extensions header file (glxext.h).")
SET(VTK_WGLEXT_FILE "${VTK_SOURCE_DIR}/Utilities/ParseOGLExt/headers/wglext.h" CACHE FILEPATH
  "Location of the WGL extensions header file (wglext.h).")