when i ccmake , it shows some error , but i don't know how to setting this CMake Error: EnableLanguage was unable to find a CMAKE_MAKE_PROGRAM CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage CMake Error: Error in cmake code at /export/home1/homhom/VTK/VTK-4.2.2/Common/CMakeLists.txt:223: Unknown CMake command "VTK_MAKE_INSTANTIATOR2". thank you!