Fredrik Salomonsson schreef op zo 15-05-2022 om 19:05 [+0000]:
> ERROR: In procedure %resolve-variable:
> Unbound variable: gexp

Make sure it's

   (arguments
     (list #:tests? (not (%current-target-system))
           #:test-command #~'("ert-runner")))

and not

   (arguments
     `(#:tests? (not (%current-target-system))
       #:test-command #~'("ert-runner"))) ; <-- won't work

. The latter won't work as-is as the #~ needs to be unquoted with
,#~'("ert-runner").  I recommend the first method ('list' instead of `
aka quasiquote) for having less complicated syntax.

If that wasn't the case or it still fails please send a copy of the
package definition.

Greetings,
Maxime.