title: Compile Veins models with c++14
body: <p>I want to use PyTorch with Veins due to which I need to compile the code using C++14 standard. I looked up OMNET++ and Veins documentation but found nothing.</p>
  <p>I am using macOS (11.5) and Ubuntu (18.04 and 20.04). I could install the precxx11 version of PyTorch for Ubuntu but there is no such option for macOS. Hence, I have no other option but to use C++14.</p>
  <p>How would I go about achieving this?</p>