Unknown CMake command "GETTEXT_PROCESS_PO_FILES" in Ubuntu 11.10

I get this error when running cmake:

CMake Error at po/ca/CMakeLists.txt:1 (GETTEXT_PROCESS_PO_FILES):
Unknown CMake command "GETTEXT_PROCESS_PO_FILES".

This is with the latest kdenlive source and Ubuntu 11.10. Another site recommended adding find_package(Gettext) to solve the same problem in another context, though I notice there is already include(FindGettext), but neither works. There is nothing defining GETTEXT_PROCESS_PO_FILES in my /usr/share/cmake-2.8/Modules/FindGettext.cmake.

Thank you,