Our sources are a snapshot of the Video4Linux Mercurial tip and no longer a different branch. You need to have your uncleaned kernel sources accessible, or, if you use a stock kernel, have the distribution-provided kernel headers for your kernel. We build the modules with this command: "KDIR=/lib/modules/$(KERNEL)/build $(MAKE) -f Makefile -e" run in the v4l-dvb/v4l directory.