When compiling on OS X: Undefined symbols for architecture x86_64:

[EdwardDeaver]

I created a new project using the project generator:

When I compile it I get this error:

Undefined symbols for architecture x86_64:
"ofApp::onMessage(ofxLibwebsockets::Event&)", referenced from:
void ofxLibwebsockets::Client::addListener(ofApp*) in ofApp.o
"ofApp::onConnect(ofxLibwebsockets::Event&)", referenced from:
void ofxLibwebsockets::Client::addListener(ofApp*) in ofApp.o
"ofApp::sendToWS(float, float, int)", referenced from:
ofApp::keyPressed(int) in ofApp.o
"ofApp::onClose(ofxLibwebsockets::Event&)", referenced from:
void ofxLibwebsockets::Client::addListener(ofApp*) in ofApp.o
"ofApp::onIdle(ofxLibwebsockets::Event&)", referenced from:
void ofxLibwebsockets::Client::addListener(ofApp*) in ofApp.o
"ofApp::onOpen(ofxLibwebsockets::Event&)", referenced from:
void ofxLibwebsockets::Client::addListener(ofApp*) 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)

[crecord]

I used the project generator on both OF 10.1 and 11.0 in OSX with this addon and all compiled without an issue. I am on High Sierra 10.12.6 using a super old version of xcode.

I would check your deployment target and make sure it is correct and check that compile sources include all necessary files:

If none of those suggestions work, perhaps it is a Mojave issue... what version of OSX are you on?