# TeXlive with biblatex - option `dashed' not defined

I'm creating a beamer presentation that uses biblatex with biber and the ieee style with dashed=false to suppress dashing of repeat author names. This compiles find on my MikTeX installation on my laptop, but will not compile on Overleaf.

Further testing on other web-based compilers showed that no TeX live installation recognises the dashed option, with any document class.

MWE:

\documentclass{article}

\usepackage[utf8]{inputenc}
\usepackage[backend=biber, style=ieee, dashed=false]{biblatex}

\begin{document}

\end{document}

How can I get dashed to work with TeX live?

• It works in texlive 2016 but not in 2015. The web-based compilers are quite often a bit outdated. You would need to get an updated version of the style, but I can't tell you if it would work with an older biblatex. – Ulrike Fischer Mar 9 '17 at 10:37
• Thanks, I feared that would be the case. Looks like there's not much I can do, but I don't use Overleaf too much anyway – Utumno Mar 9 '17 at 12:34
• according to tex.stackexchange.com/questions/357372/… overleaf uses texlive 2016, but not up-to-date but the one from ubuntu – samcarter_is_at_topanswers.xyz Mar 9 '17 at 13:05

## 1 Answer

The dashed option was added to biblatex-ieee in version 1.2 released 2016-12-26 (with this commit following discussion on the bugtracker).

Overleaf are currently running biblatex-ieee on version 1.1p from 2016-07-20, so that version does not have the dashed option. I assume that some other online compilers might be similarly behind with their versions.

If you want to use the dashed option with older versions, add

\makeatletter
\DeclareBibliographyOption[boolean]{dashed}[true]{%
\ifstrequal{#1}{true}
{\ExecuteBibliographyOptions{pagetracker}%
\renewbibmacro*{bbx:savehash}{\savefield{fullhash}{\bbx@lasthash}}}
{\renewbibmacro*{bbx:savehash}{}}}
\makeatother

and then

\ExecuteBibliographyOptions{dashed=false}

to your preamble. (You still can't use dashed=false as loading-time option though, because at that moment the option is unknown - it is only defined later in your document.)

On Overleaf https://www.overleaf.com/read/fspxdskjwpsm

Or use one of the solutions offered in Enabling dashed option for biblatex-ieee style and biblatex ieee style same authors.