Am Sonntag, dem 10.01.2021 um 11:58 -0500 schrieb Richard Kimberly Heck: > There are other uses of \@ifundefined in lib/layouts/. I'm happy to > fix them,
The special case here was that this is output after the user preamble.
Only in this case we have problems if users set \makeatletter.
I think with layouts things are not as urgent.
> but just to be clear: This construct accepts an \else clause?
> So
> \@ifundefined{#1}{#2} should become:
>
> \ifdefined
> #2
> \else
> #1
> \fi
>
> yes?
Yes, you can use \else if needed. See
http://www.texfaq.org/FAQ-isdef
Jürgen
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