[R] R-lang.epub is invalid according to epubcheck

Mstislav Elagin e|@g|n@m@t|@|@v @end|ng |rom @|umn|@hu-ber||n@de
Tue Aug 31 00:25:02 CEST 2021

Hello R folks,

when validating the epub version of "The R language definition" from


with epubcheck (https://github.com/w3c/epubcheck), the latter reports 490
errors. According to the Makefile in R sources, epubs are being produced
using calibre. Using another converter
(https://github.com/jlhg/texinfo2epub ) that transforms via Docbook XSL
leads to a clean epub (according to the epubcheck). In the past I
encountered quite a few invalid epubs that confuse my e-ink reader and
were made by calibre. Might it be worth switching the epub converter?

Best regards

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