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Re:Note from Don Knuth – bug(s) in MetaPost? by chj on Thursday January 16, 2014 @09:37AM (#7069575)
> I ran this with newly installed MacTeX from the TeX Collection 2013.

Then this:

>Unfortunately the Ubuntu engine that converts PostScript to my

So Mr. Knuth's using a Macbook and Ubuntu at the same time.

Re:Note from Don Knuth – bug(s) in MetaPost? by duaneb on Thursday January 16, 2014 @09:57AM (#7069665)
Yup—he's spoken about it[1]:

> I currently use Ubuntu Linux, on a standalone laptop—it has no Internet connection. I occasionally carry flash memory drives between this machine and the Macs that I use for network surfing and graphics; but I trust my family jewels only to Linux. Incidentally, with Linux I much prefer the keyboard focus that I can get with classic FVWM to the GNOME and KDE environments that other people seem to like better. To each their own.

[1]: http://www.informit.com/articles/article.aspx?p=1193856