[Gretl-users] using "catch" with "include"

Hey all, I am writing a package "A" which makes use of another external gretl package "B". At some stage I need to load "B" via "include B.gfn". However, I would like to check first whether B.gfn is already installed on the machine. If not I want to conduct the "install B.gfn" command. The problem is that "catch include B.gfn" doesn't seem to work currently. Is there any way to realize this? Best, Artur