SDL2.dll not found -lSDL2

[KerteszDomokos]

I'm using the QJoysticks library in windows with MinGW compiler. I'm working in QTCreator.
I have a problem if I run the code. I just include the library, not use that.

I add it to the project.pro file:

    include (./3rdparty/QJoysticks-master/QJoysticks-master/QJoysticks.pri)

And I just include #include <QJoystick>.
And if I'm running the code, I have this errors:

:-1: error: skipping incompatible [path]\3rdparty\QJoysticks-master\QJoysticks-master\lib\SDL\bin\windows\mingw/SDL2.dll when searching for -lSDL2
:-1: error: skipping incompatible [path]\3rdparty\QJoysticks-master\QJoysticks-master\lib\SDL\bin\windows\mingw/SDL2.dll when searching for -lSDL2
:-1: error: cannot find -lSDL2

My project struct is this:

    test3
        |-test3.pro
        |-main.cpp
        |-[other headers, and cpp-s]
        \-3rdparty
            \-QJoysticks-master
                \-QJoysticks-master

I'm beginner in QT, but a little advanced in c++.

Thanks!

My English isn't perfect, sorry.

[chachabules]

you may need a dll which is suffixed with .dll.a. Qt can only link dll suffixed with .dll.a in compile time.
you just need to recompile SDL2!!!!