Error! Bad return status for module build on kernel: 4.19.0-8-amd64 (x86_64)

I was rebuilding my WireGuard Docker container today and this error started popping up:

Setting up dkms (2.6.1-4) ...
Setting up wireguard-dkms (1.0.20200429-1~bpo10+1) ...
Loading new wireguard-1.0.20200429 DKMS files...
It is likely that 4.19.0-8-cloud-amd64 belongs to a chroot's host
Building for 4.19.0-8-amd64 and 4.19.0-8-cloud-amd64
Building initial module for 4.19.0-8-amd64
Error! Bad return status for module build on kernel: 4.19.0-8-amd64 (x86_64)
Consult /var/lib/dkms/wireguard/1.0.20200429/build/make.log for more information.
dpkg: error processing package wireguard-dkms (--configure):
 installed wireguard-dkms package post-installation script subprocess returned error exit status 10
Setting up build-essential (12.6) ...
Setting up libalgorithm-diff-xs-perl (0.04-5+b1) ...
Setting up libalgorithm-merge-perl (0.08-3) ...
dpkg: dependency problems prevent configuration of wireguard:
 wireguard depends on wireguard-dkms (>= 0.0.20200121-2) | wireguard-modules (>= 0.0.20191219); however:
  Package wireguard-dkms is not configured yet.
  Package wireguard-modules is not installed.

dpkg: error processing package wireguard (--configure):
 dependency problems - leaving unconfigured
Processing triggers for systemd (241-7~deb10u3) ...
Processing triggers for libc-bin (2.28-10) ...
Errors were encountered while processing:
 wireguard-dkms
 wireguard
E: Sub-process /usr/bin/dpkg returned an error code (1)

The solution was to install bc. Seems like Debian is not pulling the right dependencies. I’ll be adding it to my Dockerfile.