Dub and derelict-allegro5 "Could not find a valid dependency tree configuration"

[Pedro Lopes via Digitalmars-d-learn]

Hello,
Every time I try to run a project with derelict-allegro5 package 
as a dependency, dub says:  "Could not find a valid dependency 
tree configuration"

I already cleaned the dub cache, that does not solve it,
allegro package is installed (from alleg.sourceforge.net).

dub works with derelict-SDL, etc.

Thank you.