[Qgis-developer] qgis build error on kubuntu intrepid: Unknown CMake command "ADD_FLEX_FILES"

[G. Allegri]

I'm facing the following problem while buiding qgis unstable on
Kubuntu Intrepid:

CMake Error at core/CMakeLists.txt:98 (ADD_FLEX_FILES):
  Unknown CMake command "ADD_FLEX_FILES"

I've never seen it before and I don't know how to solve it. Does it
depend on  something wrong with the cmake from the Intrepid repo?
Any help?
Thx,
GIovanni