Hi Guix,

celluloid currently (commit 512fa6c7e5b4899cc79017b50a6d286900885b83 ) 
fails to build with the following error.

mpris/celluloid-mpris-gdbus.c:18:12: fatal error: gio/gunixfdlist.h: No such file or directory
    18 | #  include <gio/gunixfdlist.h>

Celluloid uses the glib-or-gtk-build-system. I tried adding glib to its 
inputs, but that didn't help.

Best,
Jack