[CMake] Out-of-source build broken ?

[Emmanuel Blot]

> Once you configure in the source tree, CMake will continue to use  
> the same build tree.  So, you need to remove the CMakeCache.txt and  
> CMakeFiles directory and any configured files from your source tree  
> and try again.

Ok, thanks a lot.
I thought I had fully cleaned up the source directory, but I obviously  
left some cache file, since it now works as expected.

Sorry for the noise.
Manu