Recent FC5test2+ kernel-devel packages are missing the top-level .kernelrelease
file.  The top-level Makefile appears to use it nowadays for defining KERNELRELEASE.

The effect of KERNELRELEASE being empty is that the documented kbuild Makefile
method (see Documentation/kbuild/modules.txt, section 4) no longer works as
expected; in the following, the "kbuild part" is never entered when invoking
"make -C $kernelsrcdir M=`pwd`" like also instructed in kbuild/modules.txt.

    ifneq ($(KERNELRELEASE),)
    # kbuild part of makefile
    [...]
    else
    # Normal Makefile
    [...]
    endif