新手求助，关于phonon控件的问题

[七孤星]

我用的是Qt Creator，在将phonon控件拖到设计界面后调试时无法通过，请问这是问什么呢？

编译输出显示的内容为：
ebug/moc_musicplayer.o debug/moc_titlebar.o debug/moc_toolbar.o debug/moc_statubar.o -L"e:\Qt\4.8.4\lib" -lmingw32 -lqtmaind -lQtGuid4 -lQtCored4
mingw32-make[1]: Leaving directory `E:/Qt/code/build-MusicPlayer-桌面-Debug'
debug/musicplayer.o:E:\Qt\code\build-MusicPlayer-桌面-Debug/./ui_musicplayer.h:79: undefined reference to `_imp___ZN6Phonon10SeekSliderC1EP7QWidget'
debug/musicplayer.o:E:\Qt\code\build-MusicPlayer-桌面-Debug/./ui_musicplayer.h:82: undefined reference to `_imp___ZN6Phonon12VolumeSliderC1EP7QWidget'
collect2: ld returned 1 exit status
mingw32-make[1]: *** [debug\MusicPlayer.exe] Error 1
mingw32-make: *** [debug] Error 2
15:18:59: 进程"E:\Qt\mingw\mingw\bin\mingw32-make.exe"退出，退出代码 2 。
Error while building/deploying project MusicPlayer (kit: 桌面)
当执行步骤 'Make'时
15:18:59: Elapsed time: 00:02.