-OPTION(CLITK_BUILD_VV "Build vv the 4D visualizer (requires VTK and QT)" ON)
-IF (CLITK_BUILD_VV)
- ADD_SUBDIRECTORY(${CLITK_SOURCE_DIR}/vv ${PROJECT_BINARY_DIR}/vv)
-ENDIF(CLITK_BUILD_VV)
+option(CLITK_BUILD_VV "Build vv the 4D visualizer (requires VTK and QT)" ON)
+
+if(CLITK_BUILD_VV)
+ if(VTK_VERSION VERSION_LESS 6.0.0)
+ set(vv_QT_VERSION "4" CACHE INTERNAL "Expected Qt version")
+ else()
+ if(VTK_QT_VERSION VERSION_LESS 5)
+ set(vv_QT_VERSION "4" CACHE INTERNAL "Expected Qt version")
+ else()
+ set(vv_QT_VERSION "5" CACHE INTERNAL "Expected Qt version")
+ endif()
+ endif()
+
+ add_subdirectory(${CLITK_SOURCE_DIR}/vv ${PROJECT_BINARY_DIR}/vv)
+endif(CLITK_BUILD_VV)