diff -up VTK/CMakeLists.txt.system VTK/CMakeLists.txt

--- VTK/CMakeLists.txt.system	2010-09-27 14:40:00.000000000 -0600

+++ VTK/CMakeLists.txt	2011-02-08 14:08:29.367122550 -0700

@@ -106,6 +106,11 @@ IF(CMAKE_CONFIGURATION_TYPES)

 ENDIF(CMAKE_CONFIGURATION_TYPES)

 #-----------------------------------------------------------------------------

+# Do we try to use system libraries by default?

+OPTION(VTK_USE_SYSTEM_LIBRARIES "Use the system's libraries by default." OFF)

+MARK_AS_ADVANCED(VTK_USE_SYSTEM_LIBRARIES)

+

+#-----------------------------------------------------------------------------

 # Load some macros.

 INCLUDE(vtkDependentOption)

 INCLUDE(vtkThirdParty)

diff -up VTK/CMake/vtkThirdParty.cmake.system VTK/CMake/vtkThirdParty.cmake

--- VTK/CMake/vtkThirdParty.cmake.system	2010-09-27 14:40:00.000000000 -0600

+++ VTK/CMake/vtkThirdParty.cmake	2011-02-08 14:07:46.424662568 -0700

@@ -1,6 +1,6 @@

 #-----------------------------------------------------------------------------

 MACRO(VTK_THIRD_PARTY_OPTION upper lower)

-  OPTION(VTK_USE_SYSTEM_${upper} "Use the system's ${lower} library." OFF)

+  OPTION(VTK_USE_SYSTEM_${upper} "Use the system's ${lower} library." ${VTK_USE_SYSTEM_LIBRARIES})

   MARK_AS_ADVANCED(VTK_USE_SYSTEM_${upper})

   IF(VTK_USE_SYSTEM_${upper})

     IF(EXISTS ${CMAKE_ROOT}/Modules/Find${upper}.cmake)