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diff --git a/dev-lang/cilk/cilk-5.4.6-r2.ebuild b/dev-lang/cilk/cilk-5.4.6-r2.ebuild
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+# Copyright 1999-2016 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=6
+inherit autotools flag-o-matic
+
+DESCRIPTION="Language for multithreaded parallel programming based on ANSI C"
+HOMEPAGE="http://supertech.csail.mit.edu/cilk"
+SRC_URI="http://supertech.csail.mit.edu/${PN}/${P}.tar.gz"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+IUSE="doc examples static-libs"
+
+PATCHES=(
+	"${FILESDIR}/${P}-autotools.patch"
+)
+
+src_prepare() {
+	# fix #571060 by restoring pre-GCC5 inline semantics
+	append-cflags -std=gnu89
+	append-cppflags -D_XOPEN_SOURCE=600 -D_POSIX_C_SOURCE=200809L
+	replace-flags -O[2-9] -O1
+
+	default
+	eautoreconf
+}
+
+src_configure() {
+	econf \
+		--with-perfctr=no \
+		$(use_enable static-libs static)
+}
+
+src_install() {
+	emake DESTDIR="${D}" install
+	dodoc NEWS README THANKS
+	use doc && dodoc doc/manual.pdf
+	if use examples; then
+		insinto /usr/share/doc/${PF}
+		doins -r examples
+	fi
+}