I was just hit with subtle bug with Yast -- for a long time I couldn't install
VirtualBox because as the last step it compiles kernel module and it failed and
failed all over again.

I checked, rechecked, if I had kernel sources and devel. I had.

Today I rechecked them once again -- what checking versions tab revealed? Yast
installed kernel rpm in version as in install CD and all others packages (like
-sources and -kernel) in the latest available versions.

It does not make sense, -devel package is counterpart of the "main" package and
the versions should match.