gentoo-sources-2.4.19-r1 (which seems to contain bttv-0.7.91) doesn't include the dpl3518 driver that is part of bttv-0.7.91. This driver is required for Hauppauge WinTV Theater cards. Current resolution is to download bttv-0.7.91 (http://bytesex.org/bttv/bttv-0.7.91.tar.gz), make it, and install the missing dpl3518.o to /lib/modules/2.4.19-gentoo-r1/kernel/drivers/media/video/.
Have you tried gentoo-sources-r5?
gentoo-sources-r5 does not contain the driver nor work w/o it either. The dpl3518 driver from bttv-0.7.91 is still required.
and now can you check gentoo-sources-2.4.19-r9 please?
gentoo-sources-r9 now contains all needed drivers. Thanks, and my apologies for a late reply (been out of town on business).