Ok so the one error is gone after the update but now I have:
Undefined symbols for architecture x86_64:
"sf::RenderWindow::RenderWindow(sf::VideoMode, std::string const&, unsigned int, sf::ContextSettings const&)", referenced from:
_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I don't even know where to start on these, damn