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I updated to TeXLive 2017 and couldn't get newlfm.cls to work without errors. Here is a minimal example:

\documentclass{newlfm}
\begin{document}
\begin{newlfm}
\end{newlfm}
\end{document}

LaTex is throwing undefined control sequence errors on \fancy@reset, \f@ncyolh, and \f@ncyorh.

What causes the errors? What am I missing?

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  • 4
    Welcome to TeX.SX! The fancyhdr package has been updated and those macros have been removed. This happens when a class/package uses internals of another package.
    – egreg
    Jun 29, 2017 at 20:53
  • 2
    ...and there's technically very little need to use newlfm since everything in terms of the layout can be recreated using the default article class.
    – Werner ♦
    Jun 29, 2017 at 21:00
  • @egreg: thanks for the pointer. It works now after patching newlfm.cls according to the new fancyhdr macros. For anyone who is interested, here is a patch: pastebin.com/F3KcpYYJ
    – wto
    Jun 30, 2017 at 2:44
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    And the complete patched newlfm: pastebin.com/5bkkMEap
    – Martin Monperrus
    Oct 10, 2017 at 15:10

1 Answer 1

Reset to default
35

Presumably the following patch (via etoolbox) suffices:

\usepackage{etoolbox}

\makeatletter
\patchcmd{\@zfancyhead}{\fancy@reset}{\f@nch@reset}{}{}
\patchcmd{\@set@em@up}{\f@ncyolh}{\f@nch@olh}{}{}
\patchcmd{\@set@em@up}{\f@ncyolh}{\f@nch@olh}{}{}
\patchcmd{\@set@em@up}{\f@ncyorh}{\f@nch@orh}{}{}
\makeatother

The error resulted from hard-coding package-dependent variables, which was changed in an updated release of fancyhdr. By adding the above to your preamble, the older fancyhdr names will be substituted for the newer names.

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  • As of version 4.0 of fancyhdr, \ps@@empty was renamed to \f@nch@ps@empty, and newlfm also checks to make sure that \ps@@empty is defined. If it isn't, it throws an error. Until this is fixed, it is also necessary to put \RequirePackage{fancyhdr} \makeatletter \let\ps@@empty\f@nch@ps@empty \makeatother before the \documentclass invocation, otherwise it won't be possible to use newlfm.
    – Adam Liter
    Jan 19, 2021 at 22:38
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    @AdamLiter: If you have the option of using newlfm, I'd probably just avoid it. You can do a similar job using article (with fancyhdr and geometry) and the code is more readable; the same goes for letter.
    – Werner ♦
    Jan 19, 2021 at 22:41
  • Agreed. I just had to recompile an old document that used it with TeX Live 2020, and I ran into this issue, so I just thought I would put this here in case anyone else runs into a similar issue and finds this information helpful.
    – Adam Liter
    Jan 19, 2021 at 22:43

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