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It is used *conditionally* in sphinx/texinputs/sphinxpackagesubstitutefont.sty. See https://bugzilla.redhat.com/show_bug.cgi?id=2433763#c1 for details, quoted here in case the reference gets lost in the future: Tom "spot" Callaway from comment #1: > python-sphinx [...] has a BuildRequires: tex(substitutefont.sty), > but that component is no longer upstream. > Sure enough, sphinx doesn't actually depend on the obsoleted > substitutefont tex component (anymore) and has created a wrapper > in sphinx/texinputs/sphinxpackagesubstitutefont.sty.