Qt5 Static Build yields Failed to load platform plugin "windows"

I had the same error with MinGW version of Qt (not static): "Failed to load platform plugin windows".

The solution for me was to add the DLLs libEGL.dll and libEGLd.dll.

I solved it. Thanks to this I was able to get everything to work. I added the following libraries:

opengl32.lib
Qt5PlatformSupport.lib
qwindows.lib

I also added the following to my code:

#include <QtPlugin>
Q_IMPORT_PLUGIN (QWindowsIntegrationPlugin);

For dynamic build only: Make sure you move the qwindows.dll to the following directory:

yourapp.exe
Qt5Core.dll
...
platforms/qwindows.dll
...

Note that the plugins directory is missing! You put all the needed folders from QT_BASE/.../plugins/* directly together with your binaries. BTW: I did not need libEGL.dll, but my application almost has no GUI.

My source: http://qt-project.org/forums/viewthread/27056/#122588