Hi, I just hit the very same problem with spl-linux from bpo on a Jessie system (with dkms 2.2.0.3-2).
It builds fine with dkms 2.2.0.3-4~bpo8+1. I assume this could be changed by this (in 2.2.0.3-3) [ Aron Xu ] * Added patches from Darik Horn and Ubuntu: - Correct handling of POST_BUILD (Closes: #704989) Obviously I have no clue of dkms, but in my test it fixed the issue. If this is correct I'd suggest to raise the versioned dependency for dkms on spl-dkms and zfs-dkms to (>= 2.2.0.3-3~), which should be a no-op in sid and will just pull in dkms from jessie-backports on systems installing ZFS from jessie-backports. Alternatively this change could be done only for the backported package (Ccing Al for his input here) Bernhard
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