Different versions are not binary compatible, so you cannot use 3.x libraries with 4.x code.
Point releases are binary compatible, so you can use 4.x libraries with 4.x code.
You need to rebuild.
http://developer.qt.nokia.com/faq/an...ary_compatible
Expert
Re: QPaintDevice: Must construct a QApplication before a QPaintDevice
Different versions are not binary compatible, so you cannot use 3.x libraries with 4.x code.
Point releases are binary compatible, so you can use 4.x libraries with 4.x code.
You need to rebuild.
http://developer.qt.nokia.com/faq/an...ary_compatible
If you have a problem, CUT and PASTE your code. Do not retype or simplify it. Give a COMPLETE and COMPILABLE example of your problem. Otherwise we are all guessing the problem from a fabrication where relevant details are often missing.
vaibhav (27th December 2011)
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