VTerm won't work OOTB on my emacs 28 with byte compilation, presumably because the compilation of the emacs-vterm module is hacked around in the doom VTerm module.

Emacs complains that It can't find the VTerm module.

So we need to build that module manually:

$ brew install libvterm
$ cd develop/emacs
$ git clone https://github.com/akermu/emacs-libvterm.git
$ cd emacs-libvterm
$ mkdir -p build
$ cd build
$ cmake ..
$ make

Now we need to tell emacs how to find the VTerm module. I added this on the top of my ~/.doom.d/config.el:

(add-to-list 'load-path "~/develop/emacs/emacs-libvterm")

After this, VTerm works. Toggling the terminal is SPC o t.