SlackBuilds tested with libhandy-1.8.3:

* means indirect dependency (e.g. xiphos depends on yelp, which depends
  on libhandy).

Build and run correctly:
TextSnatcher
evince
nautilus
gnome-calendar
gnome-maps
* gnome-terminal
gnome-font-viewer
gnome-calculator
baobab
yelp
* xiphos
simple-scan (UI starts up; I do not own a scanner)
bottles (UI starts up; did not try to play a windows game)
calls (UI starts up; "no voice capable modem found", which is true)
gnome-characters
gnome-weather
gnome-clocks
gnome-contacts
gnome-photos
gnome-music
gnome-connections
gnome-system-monitor
epiphany

Build only (did not run-test):
SwayNotificationCenter (I do not run Wayland)
* nwg-panel              ("")
* sushi
gnome-control-center   (won't run outside of a gnome session)
gnome-shell            ("")
gnome-boxes
gnome-builder
gdm
gnome-disk-utility
gnome-screenshot
gnome-tour
* gnome-user-share
* gmdb2
* gnucash-docs

Untested:
* nwg-shell: 106 dependencies. Maintainer can test.