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diff --git a/dev-ml/zarith/zarith-1.0.ebuild b/dev-ml/zarith/zarith-1.0.ebuild
new file mode 100644
index 000000000..49a1b3c2b
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+++ b/dev-ml/zarith/zarith-1.0.ebuild
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+# Copyright 1999-2012 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: $
+
+EAPI="4"
+
+inherit findlib eutils
+
+DESCRIPTION="Arithmetic and logic operations over arbitrary-precision integers"
+HOMEPAGE="https://forge.ocamlcore.org/projects/zarith/"
+SRC_URI="http://forge.ocamlcore.org/frs/download.php/683/${P}.tgz"
+
+LICENSE="LGPL-2.1-linking-exception"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="debug doc mpir +ocamlopt"
+
+RDEPEND=">=dev-lang/ocaml-3.12.1[ocamlopt?]
+!mpir? ( dev-libs/gmp )
+mpir? ( sci-libs/mpir )"
+
+DEPEND="${DEPEND}
+dev-lang/perl"
+
+src_prepare() {
+	epatch "${FILESDIR}/${P}-optnotrequired.patch"
+	epatch "${FILESDIR}/${P}-bytecode.patch"
+}
+
+src_configure() {
+	MY_OPTS="-ocamllibdir /usr/$(get_libdir) -installdir ${D}"
+	use mpir && MY_OPTS="${MY_OPTS} -mpir"
+	./configure ${MY_OPTS}|| die
+}
+
+src_compile() {
+	if use ocamlopt; then
+		emake all
+	else
+		emake all-byte
+	fi
+	use doc && emake doc
+}
+
+src_test() {
+	if use ocamlopt; then
+		emake test;LD_LIBRARY_PATH="." ./test || die
+	else
+		emake test.b;LD_LIBRARY_PATH="." ./test.b || die
+	fi
+}
+
+src_install() {
+	findlib_src_preinst
+	if use ocamlopt; then
+		emake install
+	else
+		emake install-byte
+	fi
+	dodoc README
+	use doc && dodoc -r html/
+}