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docs/build/latex/sphinxpackagesubstitutefont.sty

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+%% a stub for obsoleted LaTeX package substitutefont
+% The package substitutefont stopped being distributed with TeXLive
+% around August 2023 and was moved to "obsolete" section.
+% cf https://ctan.org/pkg/substitutefont
+% Trying to load it raises a LaTeX build error since.
+
+% The \substitutefont has a LaTeX kernel replacement
+%     \DeclareFontFamilySubstitution
+% which was added to LaTeX 2020-02-02
+% The aim of this stub is to do that replacement silently.
+
+% change this info string if making any custom modification
+\ProvidesPackage{sphinxpackagesubstitutefont}[2023/15/11 v7.3.0 substitutefont stub]
+
+\ifdefined\DeclareFontFamilySubstitution
+  \def\substitutefont{\DeclareFontFamilySubstitution}
+\else
+  \usepackage{substitutefont}
+\fi
+
+\endinput