Created attachment 228119 [details]
Original author is amdmi3@ (Dmitry Marakasov)  and this port was deleted  (even if it was another name, we should adjust MOVED file).
Line: libvte-2.91.so:x11-toolkits/vte3 should be replaced by USE_GNOME= vte3
io.elementary.terminal looks for /proc, so we need linprocfs(5) enabled (see pkg-message.in file).
In src/Widgets/TerminalWidget.vala there is a command, which requires dbus (dbus-send), this utility is deprecated, we should use gdbus (from devel/glib20). Moreover it uses specific builtin bash. It is better to avoid to export this command (other shells completion are wrong).
io.elementary.terminal exposes io.elementary.terminal service (only available for this terminal, (see  line 23), we have better tool with procstat(1). So we can delete the 'PROMPT_COMMAND' environment variable. I wonder if 'PANTHEON_TERMINAL_ID' is still usefull. I try dbus-send (and gdbus call) commands, none work!
In file settings, we provide generic font, otherwise contains of io.elementary.terminal is ugly (at least on my xfce session with default Gtk theme)
Based on my own port .