cmake build options - amarok

Hi All, I have a question of a similar nature to Darrell's earlier in the list (entitled Building tdesdk with cmake) but in this case about Amarok, though the answer may well apply to other packages. When building the good old fashioned way, I would have used '--enable-postgres' (amongst other options) but there appears no cmake equivalent. I had hoped that the configure/build process would detect that the depends are available and build in support automatically but that is not the case, at least for me. So, how, using cmake, do I specify that I want postgres support? Cheers, Mike. -- Any question is easy if you know the answer!