[quote author="cheng" date="1285419878"]How to build a binary package or where can I find it?[/quote]
I'd recommend that if you've not still tried, to first clean the previous installations on your device, get Nokia Qt Sdk 1.0.1, install mobility and other required pkgs from v1.0.1 to your mobile and give it a shot, if that fails then you can probably try mobility 1.1 ..
For the mobility 1.1, binary will not be available (since this is an early preview), you'll have to build it from sources ... see "this link":http://doc.qt.nokia.com/qtmobility-1.1-tp/installation.html for instructions