$ sudo make dkms-install
mkdir /usr/src/zenpower-0.1.8
cp /home/gasper/git/zenpower/dkms.conf /usr/src/zenpower-0.1.8
cp /home/gasper/git/zenpower/Makefile /usr/src/zenpower-0.1.8
cp /home/gasper/git/zenpower/zenpower.c /usr/src/zenpower-0.1.8
sed -e "s/@CFLGS@//" \
    -e "s/@VERSION@/0.1.8/" \
    -i /usr/src/zenpower-0.1.8/dkms.conf
dkms add zenpower/0.1.8

Creating symlink /var/lib/dkms/zenpower/0.1.8/source ->
                 /usr/src/zenpower-0.1.8

DKMS: add completed.
dkms build zenpower/0.1.8

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area...
make -j16 KERNELRELEASE=5.4.18-050418-generic TARGET=5.4.18-050418-generic CFLAGS_MODULE+=...(bad exit status: 2)
ERROR (dkms apport): binary package for zenpower: 0.1.8 not found
Error! Bad return status for module build on kernel: 5.4.18-050418-generic (x86_64)
Consult /var/lib/dkms/zenpower/0.1.8/build/make.log for more information.
Makefile:33: recipe for target 'dkms-install' failed
make: *** [dkms-install] Error 10

././include/linux/compiler_types.h:210:24: error: expected ‘(’ before ‘__inline’
./arch/x86/include/asm/alternative.h:128:2: error: expected identifier or ‘(’ before string constant
etc..