It looks like a problem related to the addon, not to openFrameworks.
- Go here:
https://github.com/carlesgutierrez/ofxPatterns/issues
- Click on "New Issue"
- Copy the image that you have just posted, and add in the issue that you can not compile the example, specifying which OS and which openFrameworks version are you using
- Wait for an answer from the developer.
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Ofxpatterns trobleshoot
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