[opensuse-buildservice] can't build a kmp -- %flavors_to_build undefined?

Hi, I've encountered a problem with building a kmp (home:kommerck/cdemu) -- the loop in my spec (for flavour in %flavors_to_build) doesn't run even once when building the module. My assumption is that %flavors_to_build is undefined in rpm macros. (it works when I try a local build with y2pmbuild) Did anyone encounter the same? Leon