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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xml:id="sec-language-coq">
<title>Coq</title>
<para>
Coq libraries should be installed in
<literal>$(out)/lib/coq/${coq.coq-version}/user-contrib/</literal>.
Such directories are automatically added to the
<literal>$COQPATH</literal> environment variable by the hook defined
in the Coq derivation.
</para>
<para>
Some libraries require OCaml and sometimes also Camlp5. The exact
versions that were used to build Coq are saved in the
<literal>coq.ocaml</literal> and <literal>coq.camlp5</literal>
attributes.
</para>
<para>
Here is a simple package example. It is a pure Coq library, thus it
only depends on Coq. Its <literal>makefile</literal> has been
generated using <literal>coq_makefile</literal> so we only have to
set the <literal>$COQLIB</literal> variable at install time.
</para>
<programlisting>
{stdenv, fetchurl, coq}:
stdenv.mkDerivation {
src = fetchurl {
url = http://coq.inria.fr/pylons/contribs/files/Karatsuba/v8.4/Karatsuba.tar.gz;
sha256 = "0ymfpv4v49k4fm63nq6gcl1hbnnxrvjjp7yzc4973n49b853c5b1";
};
name = "coq-karatsuba";
buildInputs = [ coq ];
installFlags = "COQLIB=$(out)/lib/coq/${coq.coq-version}/";
}
</programlisting>
</section>
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