I don’t get any compiling or linking errors (I added the Shared sources and the Syphon.framework to the Copy files build phase).
The server runs fine, I can even see the passed screen and texture when I run the Syphon Demo “Simple Client”.
The client runs without errors, but I just get a blank screen. I don’t think it’s receiving any data.
Here is a link to my projects if you want to have a look: http://silentlycrashing.net/out/SyphonExamples.zip