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Just use M cross environment (MXE). It takes the pain out of the whole process:
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Get it:
$ git clone https://github.com/mxe/mxe.git
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Install build dependencies
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Build Qt for Windows, its dependencies, and the cross-build tools; this will take about an hour on a fast machine with decent internet access; the download is about 500MB:
$ cd mxe && make qt
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Go to the directory of your app and add the cross-build tools to the PATH environment variable:
$ export PATH=<mxe root>/usr/bin:$PATH
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Run the Qt Makefile generator tool then build:
$ <mxe root>/usr/i686-pc-mingw32/qt/bin/qmake && make
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You should find the binary in the ./release directory:
$ wine release/foo.exe
Some notes:
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Use the master branch of the MXE repository; it appears to get a lot more love from the development team.
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The output is a 32-bit static binary, which will work well on 64-bit Windows.
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http://stackoverflow.com/questions/10934683/how-do-i-configure-qt-for-cross-compilation-from-linux-to-windows-target
