The sample gtkD application (gtk-demo) does not want to compile, no matter what I try, I always get an error. However, when I just run it with dub, it works fine, so I'm assuming a dependency is missing, although I have not been able to figure out which one it is. Any help would be greatly appreciated.

The error I get when I try to compile:
Error: module 'MainWindow' is in the file 'gtk/MainWindow.d' which cannot be read
import path[0] = /usr/include/d
import path[1] = /usr/include/d/druntime/import