More KDevelop woes

Hello, all. I'm still doing occasional battle with maintaining old Qt3 applications using KDevelop in Trinity 3.5.13.1 on Squeeze. When I start KDevelop, I am asked to select a TQt3 directory which must have an include directory containing tqt.h. On my system, tqt.h is in /usr/include/tqt. However, the dialog does not like that path or any parent along that path. What should this entry be? This may be related to another problem. I am having problems running the debugger in this qmake application. It often fails to find and evaluate variables. Thanks - John