Crystal-gobject shards build gi-doc does nothing

cloned crystal-gobject
run “shards build gi-doc” returns
Dependencies are satisfied
Error target gi-doc was not found in shard.yml.

For the library,

In fact i want the list of all widgets and of all functions i can call on the widgets.
For instance:
entry = Gtk::Entry.new
Which is the full list of functions i can call on the object entry ?

This is for the language dlang, but you get my point…,
https://api.gtkd.org/gtk.Entry.Entry.html

It’s a generator, so you can guess a lot of things from the official C API documentation: GTK+ 3 Reference Manual: GTK+ 3 Reference Manual

Other than that the target is found and builds for me, so not sure what to say…

Maybe because i’m using freebsd.