On 2019-05-29, LaFreniere\, Joseph wrote:
> I am attempting to package brightnessctl [0].  The repository 
> provides relevant udev rules in a file 90-brightnessctl.rules, and 
> its makefile has allowances for optionally copying and chmoding 
> those rules.

It's already packaged in Guix since late March (commit
ab7f1eb97abd49676f8e98e35e861f9785f0c2b2).

It includes the udev rules file ion the package. I forget exactly what I
did to configure the udev rules, but I recall using one of the options
right out of the manual:

  https://www.gnu.org/software/guix/manual/en/html_node/Base-Services.html

Enjoy!


live well,
  vagrant