Help needed: QtQuick 2.6 not installed

[Rajat Asthana]

Hi! I am building gcompris from source. I did everything mentioned here:
http://gcompris.net/wiki/An_exercise_for_new_contributors
 But when I build it and then run it, it shows this error message:
https://goo.gl/6M1yqg

What do I do to fix this!!
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