[linux-dvb] Compilation failure with external object directory

[Olaf Titz]

Changeset 5727:98e80288b44b introduced scripts/make_config_compat.pl
which checks a file in the kernel _source_ (include/linux/netdevice.h)
but uses the kernel _object_ directory for that (the "kdir"
parameter). This fails when the kernel was compiled outside the source
directory.

AFAIK there is no trivial way to find the real kernel source from the
object directory, so the build system would need an additional
parameter for the kernel source directory.

Olaf