app-text/docbook-sgml-utils depends on: || ( www-client/lynx www-client/elinks virtual/w3m )". However, www-client/links should also be in this list, and it used to be in the previous ebuilds.
Created attachment 87852 [details, diff]
patch that will properly add support for elinks
Unlike the current way to add support for the elinks browser used by the ebuild, this patch will not remove the support for links.
Created attachment 87853 [details, diff]
Support for links was removed because of bug #72604. It seems like the -dump option in links, although it was present since version 0.90, wasn't recognized for some reason. It does work now, however, so I've re-added it.
Thanks for your report.