[Interest] unknown module(s) in qt: designer with Qt5 (compiled in Qt4)

[Robert Wood]

Folks,

Am starting off using Qt5, as my Linux distribution has now started 
packaging Qt Creator based on Qt 5.0.2. I have managed to get rid of 
most of the errors on my first project, but am stuck on:

unknown module(s) in qt: designer

I have had a look at the analogue clock example and have QT += designer 
in the .pro file, but this still doesn't help. Qt Designer 5.0.2 is also 
installed.

Can anyone advise what I haven't done correctly please. If you need any 
other information I will happily supply. :~)

Thanks!