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diff --git a/sci-mathematics/yafu/yafu-1.34.3-r1.ebuild b/sci-mathematics/yafu/yafu-1.34.3-r1.ebuild
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index 000000000000..24b5c5e29c94
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+++ b/sci-mathematics/yafu/yafu-1.34.3-r1.ebuild
@@ -0,0 +1,53 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit flag-o-matic
+
+MY_PV="$(ver_cut 1-2)"
+DESCRIPTION="Yet another factoring utility"
+HOMEPAGE="https://sourceforge.net/projects/yafu/"
+SRC_URI="mirror://sourceforge/${PN}/${MY_PV}/${PN}-${MY_PV}-src.zip"
+
+SLOT="0"
+LICENSE="public-domain"
+KEYWORDS="~amd64 ~x86"
+
+DEPEND="
+	dev-libs/gmp:0=
+	sci-mathematics/gmp-ecm"
+RDEPEND="${DEPEND}"
+BDEPEND="app-arch/unzip"
+
+PATCHES=( "${FILESDIR}"/${P}-Makefile.patch )
+
+src_prepare() {
+	default
+	sed -i \
+		-e 's:../gmp/include:gmp:' \
+		-e 's:../gmp-ecm/include:gmp-ecm:' \
+		-e 's:# LIBS += -L../msieve/lib/linux/x86_64:LIBS += -lmsieve -lz -ldl:' \
+		-e 's:CFLAGS = -g:#CFLAGS = -g:' \
+		-e '/$(LIBS)$/s:$(CC):$(CC) $(LDFLAGS):g' Makefile || die
+	sed -i -e 's:\"config.h\":<gmp-ecm/config.h>:g' top/driver.c || die
+
+	# proper ggnfs default path
+	sed -i -e 's~strcpy(fobj->nfs_obj.ggnfs_dir,"./");~strcpy(fobj->nfs_obj.ggnfs_dir,"/usr/bin/");~' factor/factor_common.c || die
+}
+
+src_configure() {
+	append-cflags -fcommon
+	default
+}
+
+src_compile() {
+	local VAR
+	use amd64 && emake $VAR x86_64
+	use x86 && emake $VAR x86
+}
+
+src_install() {
+	dobin "${S}"/yafu
+	dodoc docfile.txt README yafu.ini
+}