Dear Danny,

thanks! That lead me on the right track. In fact it's just

> sudo -E guix ...

without the Varibale name. "-E" passes the whole environment to
sudo. Now the package works (at least on my system) and the Logitech
presenter can be used under EXWM+xcompmgr under guix-system - Great! I
would be willing to provide the package description and maintain it if
that's helpful. Have to find out about the necessary steps then...

Cheers,
Alex

On Sun, Dec 12 2021, 23:37:06, Danny Milosavljevic <dannym@scratchpost.org> wrote:

> [[PGP Signed Part:Undecided]]
> Hi,
>
> On Sun, 12 Dec 2021 21:58:14 +0100
> gyps@member.fsf.org wrote:
>
>> If I change my operating-system config to inlcude udev-rules from
>> package "projecteur" everything works fine - at least if I do it as a
>> regular user. As soon as I sudo the guix system reconfigure command the
>> package is known but it's code is not. Error message is:
>> 
>> > $ sudo guix system reconfigure ~/etc/config.scm
>> > ice-9/boot-9.scm:3329:6: In procedure resolve-interface:
>> > no code for module (projecteur)  
>> 
>> Could it be the case that sudo'ed the variable GUIX_PACKAGE_PATH is not
>> known or not interpreted correctly? Does the package need to reside
>> somewhere else than in GUIX_PACKAGE_PATH?
>
> Yeah, sudo is very paranoid. You need to pass -E GUIX_PACKAGE_PATH to it:
>
>    sudo -E GUIX_PACKAGE_PATH guix system reconfigure ~/etc/config.scm
>
> [[End of PGP Signed Part]]