Xcode 7> symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1

Getting a compile bug when trying to compile the facesubstitution demo from github.
A google search turned up

but I don't think this is the issue. Under Build Settings>Architectures> Valid Architectures I have x86_64 i386

Is it possible I am missing a link to a library or framework?

The complete error is

Undefined symbols for architecture x86_64:
"Clone::draw(float, float)", referenced from:
ofApp::draw() in ofApp.o
"Clone::update(ofTexture&, ofTexture&, ofTexture&)", referenced from:
ofApp::update() in ofApp.o
"Clone::setStrength(int)", referenced from:
ofApp::update() in ofApp.o
"Clone::setup(int, int)", referenced from:
ofApp::setup() in ofApp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)