The only “official” grbl release that supports laser work is 1.1f/g
I don’t recommend it because in the implementation of laser mode they modify the way some of the G-code commands work.
I have a version of 1.0c that implements laser support that does not require calling programs to be modified to use the new feature (laser support).
If 1.1f/g changes don’t bother you, then use version 1.1f/g to build your version of that release.
It’s been a while since I built my version, but I believe that is correct.