"Undefined symbols for architecture i386:" error message for IPCAM2SYPHON

Hello everybody,

i'm a beginner with OpenFrameworks and I want to use the IPCAM2SYPHON app (https://github.com/bakercp/IPCAM2SYPHON).
I pasted all the files on the right places but I have an error message I don't understand :

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I use Xcode 7.0.1 on Os X Yosemite.

What does that mean?

Thanks per advance,
Victor