"Form generated from reading UI file 'chat.ui'..."

This header file - ui_chat.h

Is part of btchat project and builds / runs as an independent project.

When converted to lib, then build as library and then added to main subdirs project as a library this ui_chat.h cannot be found.

Any suggestions / ideas what is missing ?

I have a guess , but would like to hear from the group BEFORE I steer the discussion in wrong direction.