[XeTeX] How to manually create the xelatex.fmt?

[Chris Travers]

2011/10/20 Zdenek Wagner <zdenek.wagner at gmail.com>:

> It would be a good way if the native packages were up-to-date and if
> they allowed me to install not only the current version but even older
> versions. As a matter of fact, I first verify that everything works
> and after that I switch PATH. Twice I needed to test a document with
> an old TL because I found that it does not work with the current
> version. This is the greatest benefit of TL. I know what I am writing.
> It happend several times that the native package of Octave included an
> incompatible change. Two such upgrades were so nasty that each of them
> forced me to spend two weeks of work just to make my code running.
>

BTW, that's *exactly* why you don't want to update existing important
systems once they are shown to be working without extensive testing
and staging, and why staying on older versions for working systems
that automatically generate documents is usually the wise course of
action.

Best Wishes,
Chris Travers