\font\SILmfont={[/usr/local/texlive/2024/texmf-dist/fonts/opentype/public/libertinus-fonts/LibertinusSerif-Semibold.otf]:+clig;+liga;+tlig;+smcp}\SILmfont
\def\SILmfontname{Libertinus Serif Semibold; Small Capitals}%