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diff --git a/sci-mathematics/lcalc/lcalc-2.0.3.ebuild b/sci-mathematics/lcalc/lcalc-2.0.3.ebuild
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+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+DESCRIPTION="Command-line utility and library for L-function computations"
+HOMEPAGE="https://gitlab.com/sagemath/lcalc"
+SRC_URI="https://gitlab.com/sagemath/lcalc/uploads/32cb4e639e3c1051eb6caf19dfe0769b/${P}.tar.xz"
+
+LICENSE="GPL-2+"
+# The subslot is the libLfunction soname major version
+SLOT="0/1"
+KEYWORDS="~amd64"
+
+# Omit USE=mpfr for now because it's broken upstream:
+#
+#   https://gitlab.com/sagemath/lcalc/-/issues/7
+#
+IUSE="+double double-double quad-double pari"
+REQUIRED_USE="^^ ( double double-double quad-double )"
+
+BDEPEND="dev-util/gengetopt"
+DEPEND="double-double? ( sci-libs/qd:= )
+	quad-double? ( sci-libs/qd:= )
+	pari? ( sci-mathematics/pari:= )"
+REPEND="${DEPEND}"
+
+src_configure() {
+	econf $(use_with pari) \
+		  --enable-precision="$(usev double)$(usev double-double)$(usev quad-double)"
+}