Ar an chéad lá is fiche de mí na Nollaig, scríobh Stephen J. Turnbull: 

 > Uwe Brauer writes:
 > 
 >  > I just learnt about latin-ltx for GNU Emacs and as far as I can see it
 >  > is also included in 21.5.x.
 > 
 > No, it's not.

It’s in the packages. The file throws an error if sufficient Unicode support
for it isn’t available. C-u C-\ TeX RET works on 21.5, and provokes an error
on 21.4 and SXEmacs.

(The file has been in the packages CVS for 16 months, but I only updated the
package infrastructure to have it installed three months ago.)

Uwe, the terrible Unicode support of 21.4, even with Mule-UCS, is the reason
for this. If you’re okay with the level of support of Mule-UCS, you can add
the lines:

  (register-input-method
   "TeX" "UTF-8" 'quail-use-package
   "\\" "LaTeX-like input method for many characters."
   "latin-ltx")

to your init file, and comment out the lines at the start of latin-ltx.el
that throw an error if the editor’s Unicode support would trash the file.