Index: VTK/CMakeLists.txt
===================================================================
--- VTK.orig/CMakeLists.txt
+++ VTK/CMakeLists.txt
@@ -132,6 +132,11 @@ 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)
Index: VTK/CMake/vtkThirdParty.cmake
===================================================================
--- VTK.orig/CMake/vtkThirdParty.cmake
+++ VTK/CMake/vtkThirdParty.cmake
@@ -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)
Index: VTK/Rendering/CMakeLists.txt
===================================================================
--- VTK.orig/Rendering/CMakeLists.txt
+++ VTK/Rendering/CMakeLists.txt
@@ -217,7 +217,8 @@ ENDIF (NOT VTK_LEGACY_REMOVE)
 
 IF(VTK_USE_GL2PS)
   SET(Kit_SRCS ${Kit_SRCS} vtkGL2PSExporter.cxx)
-
+  OPTION(VTK_USE_SYSTEM_GL2PS "Use the system's gl2ps library." ${VTK_USE_SYSTEM_LIBRARIES})
+  MARK_AS_ADVANCED(VTK_USE_SYSTEM_GL2PS)
   IF(VTK_USE_SYSTEM_GL2PS)
   ELSE(VTK_USE_SYSTEM_GL2PS)
     SET(Kit_GL2PS_SRCS ${VTK_SOURCE_DIR}/Utilities/vtkgl2ps/gl2ps.c)