Attempting to emerge v4l2loopback-0.13.1 on an x86 system fails with the error ERROR: modpost: "__moddi3" [/var/tmp/portage/media-video/v4l2loopback-0.13.1/work/v4l2loopback-0.13.1/v4l2loopback.ko] undefined! See https://github.com/umlaeute/v4l2loopback/issues/550 and the patch at https://github.com/umlaeute/v4l2loopback/commit/60be7c3f9734ab2ac87938eb15d551af18ca7870 0.12.7 is compatible, 0.13.2 (or whatever it ends up being called) will be compatible, but 0.13.1 is not compatible. Reproducible: Always