I've an idea what the problem might be - could you try with a fresh version of alsa.tcz and without mktemp
Edit: I'd modified alsaconf to work with busybox mktemp rather than the mktemp extension, but I neglected to put "busybox mktemp" somewhere in the script. I uploaded a corrected version, it should work with or without the mktemp extension now.
Let me know if it works for you, if so, I'll drop mktemp as a dep.
Edit2: There's still a problem so I've reverted to the previous version of alsa where alsaconf uses the full version of mktemp. If you delete your local copy of the alsa extension and download it again, things should now work (it works for me)