Update your distribution. Glibc is the basis for almost every application in your distribution, so the only reliable way to update it is to update the distribution where everything is then tested with the new glibc.
If you do not want to update your linux: Rebuild Qt Creator, Qt, etc. using your old distribution. That way you get binaries that are compatible with your system.
[quote author="tucnak" date="1340047221"]Do not use Google? Paranoid? Want to hear your opinion.
[quote author="Tobias Hunger" date="1340045572"]https://duckduckgo.com/?q=raspberry+pi+qt has some good links.[/quote]
You did not ask for an opinion, you asked for resources. They can be found using Google, as was rightly pointed out to you.
With exporting QT_DEBUG_PLUGIN=1, you can see if the plugin is found.
if the "Key" word matches with what every you have passed for -plugin, then it should be initialized. If further to that if its not working, then probably you are not getting mouse events.
As I wrote, I used the linuxfb plugin for QPA. But I have to mention this was on 4.8, which claimed to support QPA, but I didn't have the feeling this is really true in terms of usability. So, if there is no working linuxfb in Qt5 now, I sadly have no chance to try Qt5 on our platform.
I guess at some point I will have to fix linuxfb by myself. ;-)