@N.Sumi It doesn't work on the Jetson TK1 but it works on a desktop where I have Ubuntu 14.04 and where I built Qt Creator from the same source code.
But, while on the desktop I have a standard Ubuntu 14.04, on Jetson TK1 there is a customized version of 14.04.
I could think that there are some differences in some of the system libraries or some of those are missing. But I am not so experto to know where these differences are.
I add also the libraries suggested here http://doc.qt.io/qtcreator/creator-faq.html but withour results.
Anyway, thank you for your help.