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<H2 CLASS="section"><A NAME="htoc154">C.4</A> Installation</H2><UL>
<LI><A HREF="manual038.html#toc121">Requirements</A>
<LI><A HREF="manual038.html#toc122">Principles</A>
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<H3 CLASS="subsection"><A NAME="htoc155">C.4.1</A> Requirements</H3><A NAME="requirements"></A>
The programs <TT>hevea</TT> and <TT>hacha</TT> are written in
<A HREF="http://caml.inria.fr/ocaml/">Objective Caml</A>. Thus, you
really need Objective Caml (the more recent version, the better) to
compile them.
However, a Red Hat 7.2
<A HREF="ftp://ftp.inria.fr/INRIA/moscova/hevea/hevea-1.08-1.i386.rpm">binary distribution</A>
is also available, it does not require an Objective Caml installation
and can be installed on most Red Hat Linux PC's.<BR>
<BR>
<A NAME="imagen:needs"></A>H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A users may instruct the program not to process a
part of the input (see section <A HREF="manual009.html#imagen">6</A>). Instead, this part is
processed into a
<CODE>.gif</CODE> file and H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A outputs a link to the image file.
L<sup>A</sup>T<sub>E</sub>X source is changed into <CODE>.gif</CODE> images by the <CODE>imagen</CODE>
script, which basically calls, L<sup>A</sup>T<sub>E</sub>X, <TT>dvips</TT>,
<TT><A HREF="http://www.cs.wisc.edu/~ghost/index.html">ghostscript</A></TT>
and a few tools from the image processing package
<TT><A HREF="http://netpbm.sourceforge.net/">netpbm</A></TT>.<BR>
<BR>
To benefit from the full functionality of H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A, you need all
this software. However, H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A runs without them, but then you will
to manage to produce images by yourself.<BR>
<BR>
<A NAME="toc122"></A>
<H3 CLASS="subsection"><A NAME="htoc156">C.4.2</A> Principles</H3>
The details are given in the <TT><A HREF="ftp://ftp.inria.fr/INRIA/moscova/hevea/README">README</A></TT>
file from the distribution.
Basically, H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A should be given a library
directory. The installation procedure stores the <TT>hevea.hva</TT>
and base style files in this directory.
There are two compilation modes, the <TT>opt</TT> mode selects the
native code OCaml compiler <TT>ocamlopt</TT>, while the <TT>byte</TT>
mode selects the bytecode OCaml compiler <TT>ocamlc</TT>.
In H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A case, <TT>ocamlopt</TT> produces code that is up to three
times as fast as the one produced by <TT>ocamlc</TT>.
Thus, default compilation mode is <TT>opt</TT>, however it may be the
case on some systems that only <TT>ocamlc</TT> is available.<BR>
<BR>
Note that, when installing H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A from the source distribution, the
<TT>hevea.sty</TT> file is simply copied to H<FONT SIZE=2><sup>E</sup></FONT>V<FONT SIZE=2><sup>E</sup></FONT>A
library directory. It remains users responsibility to
make it accessible to L<sup>A</sup>T<sub>E</sub>X.<BR>
<BR>
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