Ubuntu 下 QT编译 make 时出错，求高人指点啊！！！具体错误信息如下：

Question

make: Entering directory `/home/ema/QtSDK/Demos/4.7/qmediaplayer-build-desktop-Desktop_Qt_4_8_0_for_GCC__Qt_SDK____'
g++ -Wl,-O1 -Wl,-rpath,/home/ema/QtSDK/Desktop/Qt/4.8.0/gcc/lib -o qmediaplayer main.o mediaplayer.o moc_mediaplayer.o qrc_mediaplayer.o -L/home/ema/QtSDK/Desktop/Qt/4.8.0/gcc/lib -L/usr/X11R6/lib -lphonon -lQtOpenGL -lQtGui -lQtCore -lGL -lpthread
/home/ema/QtSDK/Desktop/Qt/4.8.0/gcc/lib/libQtCore.so: undefined reference to `g_main_context_push_thread_default'
/home/ema/QtSDK/Desktop/Qt/4.8.0/gcc/lib/libQtCore.so: undefined reference to `inotify_init1@GLIBC_2.9'
/home/ema/QtSDK/Desktop/Qt/4.8.0/gcc/lib/libQtGui.so: undefined reference to `pipe2@GLIBC_2.9'
/home/ema/QtSDK/Desktop/Qt/4.8.0/gcc/lib/libQtCore.so: undefined reference to `g_main_context_pop_thread_default'
/home/ema/QtSDK/Desktop/Qt/4.8.0/gcc/lib/libQtGui.so: undefined reference to `__longjmp_chk@GLIBC_2.11'
collect2: ld returned 1 exit status
make: Leaving directory `/home/ema/QtSDK/Demos/4.7/qmediaplayer-build-desktop-Desktop_Qt_4_8_0_for_GCC__Qt_SDK____'
make: *** [qmediaplayer] Error 1
09:28:59: 进程"/usr/bin/make"退出，退出代码 2 。
构建项目qmediaplayer 时发生错误 (目标: 桌面)
当执行构建步骤 'Make'时

Answer 1

左边那一排，欢迎，编辑，项目，调试那一排，选项目，然后在qt版本里选择有效的本回答被提问者和网友采纳

Answer 2

重新qmake一下，再进行make