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From: Rudolf Schlatte <rudi@constantly.at>
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Subject: Re: use pdf-tools in Emacs.
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Hongyi Zhao <hongyi.zhao@gmail.com> writes:

> I try to use pdf-tools [1] in Emacs, but meet the following problem:

Have you tried M-x pdf-tools-install RET ?  That command compiles the
helper program that pdf-tools needs to display pdfs.  Also see the
documentation of `pdf-loader-install`, which is another function
provided by pdf-tools that I think is meant to be added to the user's
init.el file.