Hello everybody out there!

I am experiencing some troubles while using together Isomath, Mathspec and Siunitx. First, it seems that the font Linux Libertine does not have any bold italic characters. As a consequence, when using "\mathbfit" in mathematical environment, the font is not Linux Libertine, but LModern. LModern is also used with predefine function such as "\ln", and with Siunitx. Here is an example summarizing the troubles I have:

\documentclass{article}

\usepackage{isomath}
\usepackage{mathspec}
\usepackage{siunitx}

\defaultfontfeatures{Scale=MatchLowercase}
\setromanfont[Mapping=tex-text]{Linux Libertine O}
\setsansfont[Mapping= tex-text]{DejaVu Sans}
\setmonofont{DejaVu Sans Mono}
\setmathfont{Linux Libertine O}
\setmathsfont(Digits,Latin)[Numbers={Lining, Proportional}]{Linux
Libertine O}

\begin{document}
\sisetup{group-four-digits=true, output-decimal-marker={,},
   exponent-product = \cdot, detect-all, detect-inline-family=text,
   detect-inline-weight=text, detect-display-math=true}

\SI{6}{\meter \per \second} $\SI{6}{\meter \per \second}$

\emph{\bf u} $\mathbfit{u}$ $\mathbfit{\tau}$

ln $\ln$
\end{document}


    I do not know if anybody has an idea to fix these.

    Regards.

                                                    Yoann

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