title: Automatically setting jobs (-j) flag for a multicore machine?
body: <p>I have a Makefile on a machine that has a ton of cores in it, but I always seem to forget to write <code>-jX</code> when compiling my project and it takes way longer than it should. </p>
  
  <p>Is there some way I can set the <code>-j</code> flag through an environment variable or some other persistent config file so that make will automatically execute multiple jobs in parallel on this machine?</p>