Setting the GtkD Include Path in dexed?

[Ron Tarrant via Digitalmars-d-learn]

I managed to get dexed to compile a single-file dub project, but 
for completeness sake, I'm also trying to configure it to use dmd 
(non-dub) to compile GtkD projects using Compilation (menu) > 
Compile File and Run.

To that end, I have two questions...
Should I be supplying dexed with the include (read: import) path: 
/usr/include/dmd/gtkd3/

Or the runtime: /usr/lib/x86_64-linux-gnu/libgtkd-3.so

And where in dexed does one set the path so it can find a library 
such as gtkd?