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Compile Error: undefined reference to QextWinEventNotifier

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i have followed the steps here to solve problems with “qwineventnotifier_p.h” https://code.google.com/p/qextserialport/issues/detail?id=105 after that i got 2 another errors: undefined reference to QextWinEventNotifier Here is my *.pro file (sources, headers, forms omitted) include(C:/QtSDK/qextserialport-1.2rc/src/qextserialport.pri)   QT       += core gui QT       += sql   DEFINES += NCREPORT_IMPORT   greaterThan(QT_MAJOR_VERSION, 4): QT += widgets   LIBS += -L "C:/Program Files/NCReport/2.11.0.MinGW.Qt5.1.1.eval/lib" -lncreport2 INCLUDEPATH += "C:/Program Files/NCReport/2.11.0.MinGW.Qt5.1.1.eval/include"   TARGET = DBMS TEMPLATE = app   CONFIG += qt QT += network xml   RESOURCES += \     resources.qrc AND HERES MY COMPILE OUTPUT 14:04:41: Running build steps for project DBMS... 14:04:41: Configuration unchanged, skipping qmake step. 14:04:41: Starting: "C:\QtSDK\mingw\bin\mingw32-make.exe" C:/QtSDK/mingw/bin/mingw32-make.exe -f Makefile.Release mingw32-make.exe[1]: Entering directory `C:/Users/ACER/Desktop/ISKUL/STI/7' g++ -Wl,-s -mthreads -Wl,-subsystem,windows -o release\DBMS.exe object_script.DBMS.Release  -L"c:\QtSDK\Desktop\Qt\4.8.1\mingw\lib" -lmingw32 -lqtmain -lsetupapi -ladvapi32 -luser32 -L "C:/Program Files/NCReport/2.11.0.MinGW.Qt5.1.1.eval/lib" -lncreport2 -lQtSql4 -lQtXml4 -lQtGui4 -lQtNetwork4 -lQtCore4 mingw32-make.exe[1]: Leaving directory `C:/Users/ACER/Desktop/ISKUL/STI/7' ./release\qextserialport_win.o:qextserialport_win.cpp:(.text+0x56d): undefined reference to `QextWinEventNotifier::setEnabled(bool)' ./release\qextserialport_win.o:qextserialport_win.cpp:(.text+0xb41): undefined reference to `QextWinEventNotifier::QextWinEventNotifier(void*, QObject*)' collect2: ld returned 1 exit status mingw32-make.exe[1]: *** [release\DBMS.exe] Error 1 mingw32-make.exe: *** [release] Error 2 14:04:45: The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2. Error while building project DBMS (target: Desktop) When executing build step 'Make'

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