I have a USB-connected HP DeskJet Ink Advantage 1515 printer/scanner.
On my own system (this is a full Guix System, not Guix on a foreign distro) I
modified the configuration.scm:
```scheme
(use-package-modules #;... scanner)
(operating-system
#;...
(services
(append
#;...
I have a scanner in HP Photosmart C3100 series. Using simple-scan I get
the information that I need to install the driver sane-hpaio.
But simple-scan has sane-backends as input for which the Guix source file
says "This variant links in the hpaio backend, provided by hplip".
So somehow
