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Ha, I clicked this expecting a guide of X (as in the window system) architecture.

I was expecting a "Learn anything the hard way", including advice like "Practice often," and "Learn from people who are good at X."

That is what I was thinking too. Glad I read your comment before clicking the link. :)

Google cache:

Besides Dexy, this thing also needs tex live's extra fonts package to compile. On my Ubuntu 12.04 box I needed to install:

sudo apt-get install python-setuptools texlive-fonts-extra

Learn X The Hard Way