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<a
href="mn31.html#mn-port.html" >exit</a> <h3 class="SubSectionHead"><a
name="QQ1-32-72"></a>Placement of the Environment File</h3>
<a
name="index32-72001"></a> <a
name="index32-72002"></a> <a
name="index32-72003"></a> <a
name="index32-72004"></a> <a
name="index32-72005"></a><a
name="envloc"></a> The <span class="cmtt-10">tex4ht.c </span>and <span class="cmtt-10">t4ht.c </span>programs retrieve the information about their platform from an environment file.
The programs search the file at the following locations, in the given order.
<ul type="disc" >
<li>The address specified within the <a
href="mn39.html" >command lines</a> of <span class="cmtt-10">tex4ht </span>and <span class="cmtt-10">t4ht</span>, and identified there by the prefix ‘<span class="cmtt-10">-e</span>’.
</li>
<li>The address <span class="cmtt-10">tex4ht.env </span>in the work directory. </li>
<li>At the location specified by an optional environment variable named <span class="cmtt-10">TEX4HTENV</span>. </li>
<li>The address <span class="cmtt-10">tex4ht.env </span>in the <a
href="mn33.html" name="mn33.html" >root</a> directory. </li>
<li>The address provided in the variable <a
href="mn37.html#x-ENVFILE" name="ENVFILE">ENVFILE</a> of tex4ht and t4ht during compilation. </li>
<li>At the directories of kpathsea, to be searched by that utility, if the <span class="cmtt-10">tex4ht.c </span>and <span class="cmtt-10">t4ht.c </span>programs are compiled
with the ‘<span class="cmtt-10">-DKPATHSEA</span>’ switch on.
<!--l. 8046--><p class="indent" > For instance,
</p><!--l. 8048--><p class="indent" > <span class="cmtt-10">gcc -o tex4ht tex4ht.c -DENVFILE=’"~/tex4ht.dir/texmf/tex4ht/base/unix/tex4ht.env"’</span>
<span class="cmtt-10">-DKPATHSEA -DHAVE_DIRENT_H -lkpathsea</span>
</p><!--l. 8054--><p class="noindent" >or
</p><!--l. 8056--><p class="indent" > <span class="cmtt-10">gcc -O2 -DKPATHSEA -I/usr/include -L/usr/lib -o tex4ht tex4ht.c -DHAVE_DIRENT_H</span>
<span class="cmtt-10">-lkpathsea</span>
</p><!--l. 8065--><p class="indent" > When the address of <span class="cmtt-10">tex4ht.env </span>is not explicitly given, the <span class="cmtt-10">texmf.cnf </span>file might need records similar to the
following ones.
</p><div class="Verbatim"><span class="cmtt-10"> </span><span class="cmtt-10"> TEX4HTFONTSET=alias,iso8859</span><span class="cmtt-10"> </span>
<br /><span class="cmtt-10"> </span><span class="cmtt-10"> TEX4HTINPUTS=.;$TEXMF/tex4ht/base//;$TEXMF/tex4ht/ht-fonts/{$TEX4HTFONTSET}//</span><span class="cmtt-10"> </span>
<br /><span class="cmtt-10"> </span><span class="cmtt-10"> T4HTINPUTS=.;$TEXMF/tex4ht/base//</span><span class="cmtt-10"> </span>
<br /></div>
<!--l. 8075--><p class="noindent" ></p></li>
<li>The instruction
<div
class="centerline"><span class="cmtt-10">apt-get install gcc libkpathsea4 libkpathsea-dev</span></div>
<!--l. 8080--><p class="noindent" >when executed as root installs the following packages on Ubuntu/Debian.
</p><!--l. 8086--><p class="indent" >
</p><ul >
<li>gcc: the standard C compiler </li>
<li>libkpathsea4: library for TeX path searching, part of the texlive distribution provides files like
/usr/lib/libkpathsea.so.4.0.0 </li>
<li>libkpathsea-dev: development files for libkpathsea provides numerous header files (*.h) in /usr/include/kpathsea
</li></ul>
<!--l. 8099--><p class="indent" > If a file is already present, a warning is issued and the instruction can be retried after omitting the request for
the installed package.
</p>
</li></ul>
<!--l. 8109--><p class="indent" > A given address may start with the character ‘<span class="cmtt-10">~</span>’. This character is interpreted to be the directory address of the
root (as provided in an environment variable named <span class="cmtt-10">HOME</span>).
</p><!--l. 8115--><p class="indent" > The file <span class="cmtt-10">tex4ht.env </span>may be renamed to ‘<span class="cmtt-10">.tex4ht</span>’, if your system allows names consisting only of the extension
part.
</p>
<hr />
<!--l. 8122--><p class="indent" > <small>Generated August 24, 2020 - <a href="/tex4ht/">tex4ht home page</a></small></p>
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