Compilation error when using Imlib2 and Qt

The Imlib2 has to be installed to reproduce the problem. (on ubuntu libimlib2)

The simple code does not compile and gives error (see make.log attachment)

#include <Imlib2.h>
#include <QtCore/QCoreApplication>

int main(int argc, char *argv[])
{
}

It compiles fine if the include lines are swapped like this:

#include <QtCore/QCoreApplication>
#include <Imlib2.h>

int main(int argc, char *argv[])
{
}

The test code is attached.