[Qt-interest] compilation errors

[Samira Chaouki]

Hi I've this kind of error when I'm trying to compile a simple hellowolrd.

g++ -Wl,-O1 -o hello main.o    -L/usr/lib  -L/opt/qt_5_V1/qt_5/qt/lib -lQtGui -lQtCore -lpthread
/opt/qt_5_V1/qt_5/qt/lib/libQtCore.so: undefined reference to `QInotifyFileSystemWatcherEngine::create()'
/opt/qt_5_V1/qt_5/qt/lib/libQtCore.so: undefined reference to `clock_gettime'
/opt/qt_5_V1/qt_5/qt/lib/libQtCore.so: undefined reference to `QDnotifyFileSystemWatcherEngine::create()'

Can you help me please.