Ok, found it, there's an unlisted dependency on pahole
The fix is apt install pahole
- Bug#1098779: zfs-dkms: zfs/2.3.0 fails to build... jfp
- Bug#1098779: Acknowledgement (zfs-dkms: zf... Jean-Francois Pirus
- Bug#1098779: Acknowledgement (zfs-dkms: zf... Jean-Francois Pirus
- Bug#1098779: Consider adding pahole to... Shengqi Chen
- Bug#1098779: Consider adding pahol... Shengqi Chen
- Processed: Re: Consider adding pahole to D... Debian Bug Tracking System
