Hi Vincent, this bug was cloned from #848671, where people complain about error messages when starting xpdf. The messages were about configuration options for which support was removed in poppler, but which were still contained in the "language support" (configuration) files shipped with xpdf.
With this bug you seem to request that support for these options should be added back. Do you have a specific need for any one of them, or was that just meant as a reminder since the error message seems to suggest that support would be possible if only someone put in the work? My current understanding is that poppler doesn't and is not going to support these any more, at least not as part of its public API. That said, all the mapping files referenced in xpdf's "language support" files are nowadays shipped in the poppler-data package, which claims in its README that poppler will read them automatically when available. So there's really no need to try and set any of this from xpdf, no? Florian
