'dkms' option "--kernelsourcedir" usage about dkms HOT 1 OPEN

So how do I (came to an conclusions after trying many other options) set the /lib/modules/ & -kali-arm64 (side note: 4.19.157-perf-g85e27949fb09, in the error is the original android's kernel when you type uname -r)

I'm not sure, I understand this part ... which I suspect is the crux of your issues. Are you cross-compiling? What are the build and target machine? What CPU and kernel are they running? How/where did you install the respective headers, compilers, etc?

As seen in man dkms, the tool accepts optional kernel/arch arguments. When omitted, dkms will try to auto-detect them. So a simple dkms build -m 8812au -v 5.6.4.2_35491.20191025 -k 4.19.157-perf-g85e27949fb09/arm64 might suffice (note: this is a blind suggestion)

In addition to that, I suggest replacing the PROCS_NUM variable and related code in favour of the number you'd like to use. As-is it's abusing the fact that dkms is a shell script and we've (partially) neutered that.

from dkms.