libs auto-detection in dependecies are not included

I'm using arduino-mk from debian stable (1.5.2-1).

I want to split my .ino file in libraries.
I need certain libs only in other libraries (eg: TrueRandom only in Ethernet part).

But, if i don't include "TrueRandom.h" in the main .ino file, it will not get included at all.

Is this a known issue?