$ sudo guix system reconfigure /etc/config.scm
The following derivations will be built:
   /gnu/store/5xnb9ghlxq1ddln43sizwrsmqvl63fsr-system.drv
   /gnu/store/3pnflnk2hx4av12a4jqw94rs13y7b6aw-etc.drv
   /gnu/store/2d3ykyqfz74n8y2chjd30k2igbl54nr8-dbus-configuration.drv
   /gnu/store/pi3sgnvw3xcmcb3a90nw17lq0rl3pn43-dbus-system-services.drv
   /gnu/store/yh130x1my81iixj9mj5llf2m37wqrhkf-shells.drv
   /gnu/store/jbnycgcx1077fnch74ir4in8k1x6l189-activate.scm.drv
   /gnu/store/nypnxxzf7lv083zwd23p0dkwf2fl3afs-activate-service.scm.drv
   /gnu/store/vpfmh4qgq8a9v0szz1s6vxxmry85r9dy-boot.drv
   /gnu/store/lgy3vc5smgqpww3x0y7xw6rzb9cfahmb-shepherd.conf.drv
   /gnu/store/kh3nd3iki7qy63lxs68pf19s53qaz36j-grub.cfg.drv

building /gnu/store/lgy3vc5smgqpww3x0y7xw6rzb9cfahmb-shepherd.conf.drv...
building /gnu/store/pi3sgnvw3xcmcb3a90nw17lq0rl3pn43-dbus-system-services.drv...
\builder for `/gnu/store/pi3sgnvw3xcmcb3a90nw17lq0rl3pn43-dbus-system-services.drv' failed with exit code 1
build of /gnu/store/pi3sgnvw3xcmcb3a90nw17lq0rl3pn43-dbus-system-services.drv failed
View build log at '/var/log/guix/drvs/pi/3sgnvw3xcmcb3a90nw17lq0rl3pn43-dbus-system-services.drv.gz'.
cannot build derivation `/gnu/store/2d3ykyqfz74n8y2chjd30k2igbl54nr8-dbus-configuration.drv': 1 dependencies couldn't be built
building /gnu/store/yh130x1my81iixj9mj5llf2m37wqrhkf-shells.drv...
cannot build derivation `/gnu/store/3pnflnk2hx4av12a4jqw94rs13y7b6aw-etc.drv': 1 dependencies couldn't be built
cannot build derivation `/gnu/store/5xnb9ghlxq1ddln43sizwrsmqvl63fsr-system.drv': 1 dependencies couldn't be built
guix system: error: build of `/gnu/store/5xnb9ghlxq1ddln43sizwrsmqvl63fsr-system.drv' failed