4.17 to 4.18 dkms build fail 2nd try

root@rocinante:/var/log# apt install zfs-dkms spl-dkms --reinstall
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-4.17.0-1-amd64 linux-headers-4.17.0-1-common linux-image-4.17.0-1-amd64
Use 'apt autoremove' to remove them.
0 upgraded, 0 newly installed, 2 reinstalled, 0 to remove and 0 not upgraded.
Need to get 1,795 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://deb.debian.org/debian buster/contrib amd64 zfs-dkms all 0.7.9-3 [1,397 kB]
Get:2 http://deb.debian.org/debian buster/main amd64 spl-dkms all 0.7.9-3 [398 kB]
Fetched 1,795 kB in 2s (1,046 kB/s)
Preconfiguring packages ...
(Reading database ... 347582 files and directories currently installed.)
Preparing to unpack .../spl-dkms_0.7.9-3_all.deb ...

-------- Uninstall Beginning --------
Module:  spl
Version: 0.7.9
Kernel:  4.17.0-1-amd64 (x86_64)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.

spl.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.17.0-1-amd64/updates/dkms/
rmdir: failed to remove 'updates/dkms': Directory not empty
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.


splat.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.17.0-1-amd64/updates/dkms/
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

depmod...

DKMS: uninstall completed.

-------- Uninstall Beginning --------
Module:  spl
Version: 0.7.9
Kernel:  4.17.0-3-amd64 (x86_64)
-------------------------------------

Status: Before uninstall, this module version was ACTIVE on this kernel.

spl.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.17.0-3-amd64/updates/dkms/
rmdir: failed to remove 'updates/dkms': Directory not empty
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.


splat.ko:
 - Uninstallation
   - Deleting from: /lib/modules/4.17.0-3-amd64/updates/dkms/
rmdir: failed to remove 'updates/dkms': Directory not empty
 - Original module
   - No original module was found for this module on this kernel.
   - Use the dkms install command to reinstall any previous module version.

depmod...

DKMS: uninstall completed.

------------------------------
Deleting module version: 0.7.9
completely from the DKMS tree.
------------------------------
Done.
Unpacking spl-dkms (0.7.9-3) over (0.7.9-3) ...
Setting up spl-dkms (0.7.9-3) ...
Loading new spl-0.7.9 DKMS files...
Building for 4.17.0-3-amd64 4.18.0-1-amd64
Building initial module for 4.17.0-3-amd64
Done.

spl.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.17.0-3-amd64/updates/dkms/

splat.ko:
Running module version sanity check.
 - Original module
   - No original module exists within this kernel
 - Installation
   - Installing to /lib/modules/4.17.0-3-amd64/updates/dkms/

depmod...

DKMS: install completed.
Building initial module for 4.18.0-1-amd64
Error! Bad return status for module build on kernel: 4.18.0-1-amd64 (x86_64)
Consult /var/lib/dkms/spl/0.7.9/build/make.log for more information.
dpkg: error processing package spl-dkms (--configure):
 installed spl-dkms package post-installation script subprocess returned error exit status 10
Errors were encountered while processing:
 spl-dkms
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@rocinante:/var/log#