Consider the following MWE


Texlive 2015 was updated today (tmlgr update --all)

  • The command:

    xelatex file.tex

creates a .pdf file which contains 2015/01/01. The corresponding log file contains

This is XeTeX, Version 3.14159265-2.6-0.99992 (TeX Live 2015) (preloaded format=xelatex 2015.11.4) .

  • The command:

    pdflatex file.tex

creates a .pdf file which contains 2015/10/01. The corresponding log file contains

This is pdfTeX, Version 3.14159265-2.6-1.40.16 (TeX Live 2015) (preloaded format=pdflatex 2015.11.4).

I thought tmlgr would update the xelatex and pdflatex programs when the latex.ltx file is updated. This does not seem to be the case?

I ask this question, because as (r)(e)ledmac tests the value of \fmtversion to determine where to load the etex package, it might produce an error (cf https://github.com/maieul/latexhumain/issues/44).

  • It seems to be a problem with TeX Live. I issued sudo fmtutil-sys --byengine xetex and after that I got 2015/10/01 from \fmtversion. Indeed, it was 2015/01/01 before running fmtutil-sys. Make this known to the texlive mailing list.
    – egreg
    Commented Nov 8, 2015 at 19:13
  • yes, it works. So it is an issue to report to the texlive team?
    – Maïeul
    Commented Nov 8, 2015 at 19:16
  • Yes; apparently the update to the LaTeX kernel didn't trigger format recreation for XeTeX.
    – egreg
    Commented Nov 8, 2015 at 19:17
  • As answered on the TL list, it is a problem only with xe(la)tex, as far as I see. pdflatex (and latex and cslatex etc etc) should all be updated automatically. If there is a problem with (pdf)latex formats itself, please let me know.
    – norbert
    Commented Nov 10, 2015 at 1:08

1 Answer 1


This seems to be a bug in TeX Live scripts, which failed to trigger format creation after the last upgrades to the LaTeX kernel.

You can fix the thing manually by

sudo fmtutil-sys --byengine xetex --byfmt latex

Report the issue to the TeX Live mailing list.


According to the messages in the mailing list (starting from http://tug.org/pipermail/tex-live/2015-November/037480.html), the issue should have been solved with revision 38810 of TeX Live.

  • done, I have send an email.
    – Maïeul
    Commented Nov 8, 2015 at 19:25
  • The 3.14159265-2.6-0.99992 is not supposed to change? Only the date?
    – cfr
    Commented Nov 8, 2015 at 21:45
  • @cfr That's the banner of the executable, which is independent of the format.
    – egreg
    Commented Nov 8, 2015 at 21:46
  • Thanks. I just wanted to be clear that I hadn't done something wrong.
    – cfr
    Commented Nov 8, 2015 at 21:46

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