Can't get qdevelop to debug

[JeanC]

I am *almost* sure I meet all requirements.

Qt on linux is with debug info.
dbg is installed.
The project is in debugmode.

If I put a breakpoint in main, as shown here http://qdevelop.free.fr/doc-en.php#mozTocId388196
and start debugging, nothing happens, no blue line, the program just runs.

The outputwindow displays a few times (dbg) so that's probably running,

Any help appreciated.

I'm new to linux and qt, things are going slowly enough by itself, not being able to debug wont help

Thanks.