How can I build 64 bit Qt on a 32 bit system ?

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Answer:

You will not be able to run 64 bit applications on your 32 bit machine. If you want to build Qt as 64 bit, then you will first have to build the tools that Qt uses as 32 bit. This means that you will have to run configure in a 32 bit command prompt and go into the src/tools directory and type nmake there to build rcc, uic and moc. Now you can open a 64 bit command prompt and build Qt there (don't configure in the 64 bit shell though). Note that you will not be able to run any of the applications you create with the 64 bit built Qt. You will have to deploy them to a 64 bit machine to run them.