The folder structure dosen't follow the of addons standard layout: http://ofxaddons.com/howto You have to manually copy things into the right place, which also makes it hard to work on after cloning.
I'd suggest this layout:
ofxARToolkitPlus
ofxARToolkitPlus/include
ofxARToolkitPlus/lib
ofxARToolkitPlus/src
ofxARToolkitPlus/example
ofxARToolkitPlus/example/bin
ofxARToolkitPlus/example/src
The folder structure dosen't follow the of addons standard layout: http://ofxaddons.com/howto You have to manually copy things into the right place, which also makes it hard to work on after cloning.
I'd suggest this layout: