On the website it says
Quote:
If you are in a hurry and assuming you have a reasonably up-to-date system you might be able to run Epiphany by just building a few dependencies instead of most of the GNOME stack. Try this:
so its clear that it might not actually work in which case you need to modify it to include more of the gtk stack that you are missing. In your case ATK. Try adding atk to the command line and see how it goes. ATK and GTK's relationship has undergone some major changes in GTK3 and its frankly still quite a mess and will be until at least 3.8