I'm trying to use Minion Pro but I get an error.
This works:
\IfFileExists{lucimatx.sty}{\usepackage[stdmathitalics=true,math-style=default,lucidasmallscale=true,romanfamily=bright]{lucimatx}}{\usepackage{times}}
This won't work:
\IfFileExists{MinionPro.sty}{\usepackage[mathlf,textlf,minionint,openg]{MinionPro}}{\usepackage{times}}
\IfFileExists{lucimatx.sty}{\usepackage[bb=lucida,bbscaled=1,cal=boondoxo]{mathalfa}}{}
The error is
! Missing $ inserted.
<inserted text>
$
l.475 \settowidth{\notwd}{$\not$}
It's problematic because this worked with Tex Live 2016 on my old laptop.
\usepackageinside conditionals. – David Carlisle Sep 23 '21 at 23:29