I don't have iftex.sty installed (Fedora 25), so its not required directly. Your tex installation might (erroneously) have it as a transitive dependency, though. I'd try with a clean build first. Otherwise install the iftex package:
$ tlmgr search --file iftex.sty iftex: texmf-dist/tex/generic/iftex/iftex.sty On Saturday, April 29, 2017 at 11:30:36 AM UTC+2, Daniel Krenn wrote: > > On 2017-04-29 11:27, Daniel Krenn wrote: > > Building the pdf version of the documentation e.g. for > > reference/asymptotic fails in the current beta (8.0.beta4). It also > > fails in 8.0.beta2, but works in 7.6. > > > > What can cause this? > > FYI, from the log: > > ! LaTeX Error: File `iftex.sty' not found. > > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
