Qt from Linux to Windows target

Just use M cross environment (MXE). It takes the pain out of the whole process:

Get it:

$ git clone https://github.com/mxe/mxe.git

Install build dependencies
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
```
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
```

Run the Qt Makefile generator tool then build:

$ <mxe root>/usr/i686-pc-mingw32/qt/bin/qmake && make

You should find the binary in the ./release directory:
```
$ wine release/foo.exe
```

Some notes:

Use the master branch of the MXE repository; it appears to get a lot more love from the development team.
The output is a 32-bit static binary, which will work well on 64-bit Windows.

http://stackoverflow.com/questions/10934683/how-do-i-configure-qt-for-cross-compilation-from-linux-to-windows-target