Comment 6 for bug 1562560

It looks like this was introduced upstream in cups-filters (1.4.0-1). Here is what the changelog says:

cups-filters (1.4.0-1) unstable; urgency=medium

[...]

  * Added dependencies on imagemagick (>= 6.4~), liblouisutdml-bin, and
    poppler-utils to cups-filters, as they are needed to convert images, text,
    and PDF to Braille, added antiword and docx2txt to Suggests: as they allow
    converting Word files to Braille

 -- Didier Raboud <email address hidden> Tue, 15 Dec 2015 11:04:23 +0100