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Hi dornhege, thanks for your answer. I tried what you say, but I don't know what is libsfmt, there isn't in my system so I copied a yaml file for rosdep from the "Piano" example. Now the make command for the impromptu_buttons example is ok, but when I try to launch it with the command "rosrun impromptu_buttons buttons" I get the error below:

:~$ rosrun impromptu_buttons buttons /home/administrator/kinect_demos/mit-ros-pkg/kinect_utils/impromptu_buttons/bin/buttons: symbol lookup error: /usr/local/lib/libsfml-audio.so.1.6: undefined symbol: _ZTIN2sf6ThreadE :~$

Do you know the possible solution to this error?

Thanks