title: Mac terminal says: "Cannot open display...aborting"
body: <p>When I'm using XFoil (for Mac, XQuartz installed) and I'm trying to plot something, the above message comes out. Another thing, I've used the instructions of the following link to install Gnuplot and I'm worried I did some damage... it's all ok with this?
  <a href="http://macappstore.org/gnuplot/" rel="nofollow noreferrer">http://macappstore.org/gnuplot/</a></p>