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    <p>I don't think that there's any need for cross-compilation. There are two problems:</p> <ol> <li><p>Getting Xlib compiled for Windows. I don't know offhand of any maintained Xlib implementations that are ported to Windows. You will definitely need to find one, or make one. Hopefully Xlib depends only on a handful of posix APIs and they may be easy to translate to win32. Forget about Cygwin.</p> <p>You may have luck porting Xlib yourself to Qt's network backend and making it cross-platform in the process, too. Xlib would simply use the core and network modules of Qt. No problem with that.</p> <p>The good news here are that Qt 5 comes with a bundled Xlib implementation. It would be presumably much easier to get that to compile on Windows than some other implementation.</p></li> <li><p>Configuring Qt to build using said Xlib on Windows. To do it right, you'll probably want to mess a bit with and rebuild the configure tool that comes with Qt, and add a makespec that will link with the Xlib.</p> <p>This should be much easier to do with Qt 5.</p></li> </ol> <p>It's not an entirely trivial thing to do, but should be possible. Give yourself a month and expect to get very intimate with some details of Qt's configuration and Xlib.</p> <h3>Notes About Cygwin</h3> <ol> <li><p>If your application is closed-source and distributed outside of your organization, you need to buy a commercial license in order to redistribute cygwin.dll. Otherwise, Cygwin is GPL and merely linking to cygwin.dll makes your application a derived work.</p></li> <li><p>Cygwin becomes problematic when you mix posix- and non-posix code in the same application, especially if the non-posix code is a large framework like Qt. You can of course use the Posix platform code in Qt and make it all run on Cygwin, but that way you lose performance and expose yourself to shortcoming of Cygwin's emulation of POSIX APIs.</p></li> <li><p>Using Cygwin for Xlib / windowing system but having Qt otherwise use Windows APIs may require a lot of tweaking for Qt code. So may using Qt with Xlib on Windows of course, but at least you don't have to debug/work around Cygwin's quirks.</p></li> </ol>
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