On Sunday 01 May 2011 22:09:42 Serghei Amelian wrote:
[...]

> Actually is not correct. "qapplication.h" should be under
> "/opt/qt/include", not deeper. Do not mix qt3 locations with tqt's.

If you really want to mix them, use QT_INCLUDE_DIR for indicate where qt 
headers reside (in your case -DQT_INCLUDE_DIR=/opt/qt/include/qt )

-- 
Serghei