[Qt-creator] Cannot mix incompatible Qt libraries

[Daniel Teske]

> Don’t know if it’s related, but I thought that maybe I might have a path
> problem.  I checked under  Tools>Options>Qt4.  The only listing there is: 
> Name = System Qt , Path = /usr   and this does not allow me to edit the
> path (although I can add others).  Does this look ok?
Yes that looks okay.  Could you run ldd on the executable? That should tell 
you which libraries are it links again. Somehow it apparently picks up a wrong 
one.

daniel