Unsolved Create Project Leap Motion with Qt + windows8.1

[zakin]

hi,
i try to compile your programm https://lemirep.wordpress.com/2013/10/17/using-a-leapmotion-for-qt-inputs/
But i have 202 errors like this: Error: undefined reference to `Leap::Hand::sphereCenter() const'
What can be the problem? what's the mechanism to create and setting up a programm in qt.
I use Qt 5.4 with windows 8.1 64bit
Thinx

[SGaist]

Hi and welcome to devnet,

Did you setup the LeapMotion SDK ?

Are you linking to properly from your project ?