I prefer to use MSVC libs and see a few reasons to use MinGW on Windows' builds.
I told you about MinGW just because the logs in your original post show that fact you used MinGW tools to compile app.
g++ -Wl,-s -Wl,-subsystem,console -o release\tests.exe release/tests.o release/moc_tests.o release/qrc_tests.o -L"c:\qt-everywhere-opensource-src-4.7.4\lib" -LE:/qxmpp-0.3.0/lib -lqxmpp -lQtTest -lQtXml -lQtGui -lQtNetwork -lQtCore gdi32.lib comdlg32.lib oleaut32.lib imm32.lib winmm.lib winspool.lib msimg32.lib c:\qt-everywhere-opensource-src-4.7.4\lib\QtCore.lib kernel32.lib user32.lib shell32.lib uuid.lib ole32.lib advapi32.lib ws2_32.lib /LIBPATH:C:\OpenSSL-Win32\lib
mingw32-make[2]: Leaving directory `E:/qxmpp-build-desktop-Qt_4_7_4__qt-everywhere-opensource-src-4_7_4__Release/tests'
mingw32-make[1]: Leaving directory `E:/qxmpp-build-desktop-Qt_4_7_4__qt-everywhere-opensource-src-4_7_4__Release/tests'
g++: gdi32.lib: No such file or directory