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-@c This is part of the preview-latex manual.
-@c Copyright (C) 2002, 2003, 2004, 2005, 2006, 2009
-@c               2017, 2021 Free Software Foundation, Inc.
-@c See file preview-latex.texi for copying conditions.
-@ifset rawfile
-@include macros.texi
-
-@node Frequently Asked Questions, Introduction to FAQ, (dir), (dir)
-@top Frequently Asked Questions about @previewlatex{}
-
-@contents
-
-@end ifset
-
-@menu
-* Introduction to FAQ::         
-* Requirements::                
-* Installation Trouble::        
-* Customization::               
-* Troubleshooting::               
-* Other formats::               
-@end menu
-
-@comment we need at least one chapter, or the numbers disappear in the
-@comment plain version of the FAQ.
-
-@ifset rawfile
-@node Introduction to FAQ, Requirements, Frequently Asked Questions, Frequently Asked Questions
-@chapter Introduction
-@raisesections
-@end ifset
-@ifclear rawfile
-@node Introduction to FAQ, Requirements, Frequently Asked Questions, Frequently Asked Questions
-@section Introduction
-@end ifclear
-
-@subsection How can I contribute to the FAQ?
-
-Send an email with the subject:
-@example
-Preview FAQ
-@end example
-to @email{auctex-devel@@gnu.org}.
-
-@node Requirements, Installation Trouble, Introduction to FAQ, Frequently Asked Questions
-@section Requirements
-
-@subsection Which version of Emacs is needed?
-
-@previewlatex{} nominally requires @w{GNU Emacs} with a version of at
-least 25.1.
-
-@subsection Which versions of Ghostscript and @AUCTeX{} are needed?
-
-We recommend to use GNU or AFPL Ghostscript with a version of at least
-7.07.
-
-@previewlatex{} has been distributed as part of @AUCTeX{} since version
-11.80.  If your version of @AUCTeX{} is older than that, or if it does
-not contain a working copy of @previewlatex{}, complain to wherever you
-got it from.
-
-@subsection I have trouble with the display format...
-We recommend keeping the variable @code{preview-image-type} set to
-@code{dvipng} (if you have it installed) or @code{png}.  This is the
-default and can be set via the @samp{Preview/Customize} menu.
-
-All other formats are known to have inconveniences, either in file size
-or quality.  There are some Emacs versions around not supporting
-@acronym{PNG}; the proper way to deal with that is to complain to your
-Emacs provider.  Short of that, checking out @acronym{PNM} or
-@acronym{JPEG} formats might be a good way to find out whether the lack
-of @acronym{PNG} format support might be the only problem with your
-Emacs.
-
-@subsection For which OS does preview work?
-
-It is known to work under the X Window System for Linux and for several
-flavors of Unix: we have reports for HP and Solaris.
-
-There are several development versions of Emacs around for native MacOS
-Carbon, and @previewlatex{} is working with them, too.
-
-With Windows, both native Emacs and Cygwin Emacs should work.  However, it
-is known that @url{https://miktex.org/,MiK@TeX{}} sometimes doesn't work
-with @previewlatex{}.  In that case, use
-@url{https://tug.org/texlive/,@TeX{} Live} instead.
-
-@node Installation Trouble, Customization, Requirements, Frequently Asked Questions
-@section Installation Trouble
-
-@subsection I just get @samp{LaTeX found no preview images}.
-
-The reason for this is that @LaTeX{} found no preview images in the
-document in question.
-
-One reason might be that there are no previews to be seen.  If you have
-not used @previewlatex{} before, you might not know its manner of
-operation.  One sure-fire way to test if you just have a document where
-no previews are to be found is to use the provided example document
-@file{circ.tex} (you will have to copy it to some directory where you
-have write permissions).  If the symptom persists, you have a problem,
-and the problem is most likely a @LaTeX{} problem.  Here are possible
-reasons:
-
-@table @asis
-
-@item Filename database not updated
-Various @TeX{} distributions have their own ways of knowing where the
-files are without actually searching directories.  The normal
-@previewlatex{} installation should detect common tools for that purpose
-and use them.  If this goes wrong, or if the files get installed into a
-place where they are not looked for, the @LaTeX{} run will fail.
-
-@item An incomplete manual installation
-This should not happen if you followed installation instructions.
-Unfortunately, people know better all the time.  If only
-@file{preview.sty} gets installed without a set of supplementary files
-also in the @file{latex} subdirectory, @previewlatex{} runs will not
-generate any errors, but they will not produce any previews, either.
-
-@item An outdated @file{preview} installation
-The @file{preview.sty} package is useful for more than just
-@previewlatex{}.  For example, it is part of @w{@TeX{} Live}.  So you have
-to make sure that @previewlatex{} does not get to work with outdated
-style and configuration files: some newer features will not work with
-older @TeX{} style files, and really old files will make
-@previewlatex{} fail completely.  There usual is a local @file{texmf}
-tree, or even a user-specific tree that are searched before the default
-tree.  Make sure that the first version of those files that gets found
-is the correct one.
-@end table
-
-@node Customization, Troubleshooting, Installation Trouble, Frequently Asked Questions
-@section Customization
-
-@subsection How to include additional environments like @code{enumerate}
-
-By default, @previewlatex{} is intended mainly for displaying
-mathematical formulas, so environments like @code{enumerate} or
-@code{tabular} (except where contained in a float) are not included.
-You can include them however manually by adding the lines:
-
-@example
-\usepackage[displaymath,textmath,sections,graphics,floats]@{preview@}
-\PreviewEnvironment@{enumerate@}
-@end example
-@noindent
-in your document header, that is before 
-
-@example
-\begin@{document@}
-@end example
-@noindent
-In general, @file{preview} should be loaded as the last thing before
-the start of document.
-
-Be aware that
-
-@example
-\PreviewEnvironment@{...@}
-@end example
-@noindent
-does not accept a comma separated
-list!  Also note that by putting more and more 
-
-@example
-\PreviewEnvironment@{...@}
-@end example
-@noindent
-in your document, it will look more and more like a @acronym{DVI} file
-preview when running @previewlatex{}.  Since each preview is treated as
-one large monolithic block by Emacs, one should really restrict
-previews to those elements where the improvement in visual
-representation more than makes up for the decreased editability.
-
-@subsection What if I don't want to change the document?
-The easiest way is to generate a configuration file in the current
-directory.  You can basically either create @file{prdefault.cfg} which
-is used for any use of the @samp{preview} package, or you can use
-@file{prauctex.cfg} which only applies to the use from with Emacs.  Let
-us assume you use the latter.  In that case you should write something like
-
-@example
-\InputIfFileExists@{preview/prauctex.cfg@}@{@}@{@}
-\PreviewEnvironment@{enumerate@}
-@end example
-@noindent
-in it.  The first line inputs the system-wide default configuration
-(the file name should match that, but not your own
-@file{prauctex.cfg}), then you add your own stuff.
-
-@subsection Suddenly I get gazillions of ridiculous pages?!?
-
-When @previewlatex{} works on extracting its stuff, it typesets each
-single preview on a page of its own.  This only happens when actual
-previews get generated.  Now if you want to configure @previewlatex{} in
-your document, you need to add your own @code{\usepackage} call to
-@samp{preview} so that it will be able to interpret its various
-definition commands.  It is an error to add the @code{active} option to
-this invocation: you don't want the package to be active unless
-@previewlatex{} itself enables the previewing operation (which it will).
-
-@subsection Does @previewlatex{} work with presentation classes?
-
-@previewlatex{} should work with most presentation classes.  However,
-since those classes often have macros or pseudo environments
-encompassing a complete slide, you will need to use the customization
-facilities of @file{preview.sty} to tell it how to resolve this, whether
-you want no previews, previews of whole slides or previews of inner
-material.
-
-@node Troubleshooting, Other formats, Customization, Frequently Asked Questions
-@section Troubleshooting
-
-@subsection Preview causes all sort of strange error messages
-
-When running @previewlatex{} and taking a look at either log file or
-terminal output, lots of messages like
-
-@example
-! Preview: Snippet 3 started.
-<-><->
-      
-l.52 \item Sie lassen sich als Funktion $
-                                         y = f(x)$ darstellen.
-! Preview: Snippet 3 ended.(491520+163840x2494310).
-<-><->
-      
-l.52 \item Sie lassen sich als Funktion $y = f(x)$
-                                                   darstellen.
-@end example
-@noindent
-appear (previous versions generated messages looking even more like
-errors).  Those are not real errors (as will be noted in the log
-file).  Or rather, while they @strong{are} really @TeX{} error
-messages, they are intentional.  This currently is the only reliable
-way to pass the information from the @LaTeX{} run of @previewlatex{} to
-its Emacs part about where the previews originated in the source text.
-Since they are actual errors, you will also get @AUCTeX{} to state
-@example
-Preview-LaTeX exited as expected with code 1 at Wed Sep  4 17:03:30
-@end example
-@noindent
-after the @LaTeX{} run in the run buffer.  This merely indicates that
-errors were present, and errors will always be present when
-@previewlatex{} is operating.  There might be also real errors, so in
-case of doubt, look for them explicitly in either run buffer or the
-resulting @file{.log} file.
-
-@subsection Why do my @acronym{DVI} and @acronym{PDF} output files vanish?
-
-In order to produce the preview images @previewlatex{} runs @LaTeX{} on
-the master or region file.  The resulting @acronym{DVI} or @acronym{PDF}
-file can happen to have the same name as the output file of a regular
-@LaTeX{} run.  So the regular output file gets overwritten and is
-subsequently deleted by @previewlatex{}.
-
-@subsection My output file suddenly only contains preview images?!
-
-As mentioned in the previews @acronym{FAQ} entry, @previewlatex{} might
-use the file name of the original output file for the creation of
-preview images.  If the original output file is being displayed with a
-viewer when this happens, you might see strange effects depending on the
-viewer, e.g.@: a message about the file being corrupted or the display of
-all the preview images instead of your typeset document.  (Also
-@pxref{Customization}.)
-
-
-@node Other formats, , Troubleshooting, Frequently Asked Questions
-@section @previewlatex{} when not using @LaTeX{}
-
-@subsection Does @previewlatex{} work with  PDF@LaTeX{}?
-
-Yes, as long as you use @AUCTeX{}'s own PDF@LaTeX{} mode and have not
-messed with @samp{TeX-command-list}.
-
-@subsection Does @previewlatex{} work with @samp{elatex}?
-
-No problem here.  If you configure your @AUCTeX{} to use @samp{elatex},
-or simply have @samp{latex} point to @samp{elatex}, this will work fine.
-Modern @TeX{} distributions use e@TeX{} for @LaTeX{}, anyway.
-
-@subsection Does @previewlatex{} work with @ConTeXt{}?
-
-In short, no.  The @samp{preview} package is
-@LaTeX{}-dependent.  Adding support for other formats requires
-volunteers.
-
-@subsection Does @previewlatex{} work with plain @TeX{}?
-
-Again, no.  Restructuring the @samp{preview} package for @samp{plain}
-operation would be required.  Volunteers welcome.
-
-In some cases you might get around by making a wrapper pseudo-Master
-file looking like the following:
-
-@example
-\documentclass@{article@}
-\usepackage@{plain@}
-\begin@{document@}
-\begin@{plain@}
-\input myplainfile
-\end@{plain@}
-\end@{document@}
-@end example