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@@ -31,3 +31,7 @@ SET(VTK_WGLEXT_FILE "${VTK_SOURCE_DIR}/Utilities/ParseOGLExt/headers/wglext.h"
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# work around an old bug in VTK
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SET(TIFF_RIGHT_VERSION 1)
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+# for very old VTK (versions prior to 4.2)
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+if (NOT VTK_MAJOR_VERSION)
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+ message (FATAL_ERROR "You are trying to build a very old version of VTK (prior to VTK 4.2). To do this you need to use CMake 2.0 as it was the last version of CMake to support VTK 4.0.")
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+endif (NOT VTK_MAJOR_VERSION)
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Ken Martin