Why I need DUB? Will never DMD don't just use import for import packages?

[Alain De Vos]

Here an example of using gtkd without dub :
ldc2 -I/usr/local/include/d/gtkd-3 -L-lgtkd-3 -L-ldl hello.d
When you run dub with parameters "--verbose" it informs you what 
is going on.

I have not figured out how to use tkd without dub.
It would be nice to know how.