On 17.06.15, Jürgen Spitzmüller wrote:
> 2015-06-17 10:37 GMT+02:00 Guenter Milde:
> On 2015-06-16, Steve Hnizdur wrote:
> > The point is that the \usepackage(undertilde} added by Lyx to the
> > preamble doesn't load the undertilde.tex file. The compilation error
> > is that undertilde.sty is not found. Hence \input{undertilde} is
> > needed in the preamble and has to supplied by the user.
...
> Before applying this, we would need to check why it seemed to work
> in some cases.
> There is a package undertilde.sty, but it is not included in TeXLive,
> probably since it has no proper license:
> [1]http://www.ctan.org/tex-archive/macros/latex/contrib/undertilde
> It is included in MikTeX, though.
This may explain why we did not spot the problem until now. OTOH, the
existence of a special case handling in LaTeXFeatures.cpp indicates that
this may be a regression (for TeXLive users) ...
> The plain tex package undertilde-gen, on the other hand, which provides
> undertilde.tex, is included both in MikTeX and TeXLive:
> [2]http://www.ctan.org/pkg/undertilde-gen
This is quite strange, as *both* packages have the license status
Lizenz Unknown Status, No Information Available
Maybe there is a purging process running and undertilde.tex will also be
removed from TeXLive at some point.
> I have no idea if they could replace each other easily.
Not easily:
* undertilde.tex (undertilde-gen) defines \undertilde
undertilde.sty (undertilde) defines \utilde
* http://www.ctan.org/pkg/undertilde-gen says:
Benjamin Bayart's undertilde (for all its faults) does the job
better.
Looks like a task for LaTeX configuration (search for the packages and
insert the correct code). Alternatively, LaTeXFeatures could insert:
\IfFileExists{undertilde.sty}
{\usepackage{undertilde}} % not in TeXLive
{\input{undertilde} % try undertilde.tex
\providecommand{\utilde}{\undertilde}}
Günter
