runtime libpng problem: Qt 5.2 for iOS app

Hello everybody,

I have a QWidget app running in iPad and iPhone properly with Qt 5.2, but my png images are not loading properly (and they do in other platforms).

The only thing I have is a message (repeated many times) by stdout:
libpng warning: Application built with libpng-1.5.10 but running with 1.6.1

I dont know what to do now.
I think compile by myselft Qt 5.2, changing something related to libpng library, is not what i need here.
Ant ideas?

thank you
dani