Hi,

is there anything in Guix that can do things at install time, like postinst
scripts in Debian?

A program in a package I created is trying to access /var, but has no
permissions. (Well, /gnu/store/.../var)
The 'install' make target was doing 'chgrp' and 'install -g', but I had to
remove these because there was no such group in the chroot jail. And it
would be wrong anyway, as the gid in the jail would be different from that
in the systems where the package will be installed.
So, I guess /gnu/store/.../var has to be chgrp-ed during installation, on
the user's system.

Any hints?

-- 
Regards,
Georgi Kirilov