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diff --git a/sci-physics/pythia/pythia-8.1.45.ebuild b/sci-physics/pythia/pythia-8.1.45.ebuild
new file mode 100644
index 000000000000..df37efcf3c07
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+++ b/sci-physics/pythia/pythia-8.1.45.ebuild
@@ -0,0 +1,90 @@
+# Copyright 1999-2010 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: /var/cvsroot/gentoo-x86/sci-physics/pythia/pythia-8.1.45.ebuild,v 1.1 2010/11/20 08:25:12 bicatali Exp $
+
+EAPI=2
+
+inherit eutils versionator
+
+MV=$(get_major_version)
+MY_P=${PN}$(replace_all_version_separators "" ${PV})
+
+DESCRIPTION="Lund Monte Carlo high-energy physics event generator"
+HOMEPAGE="http://home.thep.lu.se/~torbjorn/Pythia.html"
+SRC_URI="http://home.thep.lu.se/~torbjorn/${PN}${MV}/${MY_P}.tgz"
+
+LICENSE="GPL-2"
+SLOT="8"
+KEYWORDS="~amd64 ~hppa ~sparc ~x86"
+IUSE="doc examples +hepmc static-libs"
+
+DEPEND="hepmc? ( sci-physics/hepmc )"
+RDEPEND="${DEPEND}"
+
+S="${WORKDIR}/${MY_P}"
+
+src_configure() {
+	use hepmc && export HEPMCVERSION=2 HEPMCLOCATION=/usr
+	# homemade configure script creates a useless config.mk
+	rm -f config.mk
+	cat > config.mk <<-EOF
+		SHAREDLIBS = yes
+		LDFLAGSSHARED = -shared ${LDFLAGS}
+		LDFLAGLIBNAME = -Wl,-soname
+		SHAREDSUFFIX = so
+	EOF
+	if ! use static-libs; then
+		sed -i \
+			-e '/targets.*\.a/d' \
+			-e 's/+=\(.*libpythia8\)/=\1/' \
+			Makefile || die
+		sed -i \
+			-e 's:\.a:\.so:g' \
+			-e 's:$(LIBDIRARCH):$(LIBDIR):g' \
+			examples/Makefile || die
+	fi
+}
+
+src_test() {
+	cd "${S}"/examples
+	# use emake for parallel instead of long runmains
+	emake \
+		$(ls main0{1..9}*.cc | sed -e 's/.cc//') \
+		|| die "emake tests failed"
+	for i in main0{1..9}*.exe; do
+		./${i} > ${i}.out || die "test ${i} failed"
+	done
+	if use hepmc; then
+		emake main31 main32 || die "emake tests for hepmc failed"
+		./main31.exe > main31.exe.out || die
+		./main32.exe main32.cmnd hepmcout32.dat > main32.exe.out || die
+	fi
+	emake clean && rm -f main*out
+}
+
+src_install() {
+	dolib.so lib/*so || die "shared lib install failed"
+	if use static-libs; then
+		dolib.a lib/archive/* || die "static lib install failed"
+	fi
+
+	insinto /usr/include/${PN}
+	doins include/* || die "headers install failed"
+
+	# xmldoc needed by root
+	insinto /usr/share/${PN}
+	doins -r xmldoc || die "xmldoc install failed"
+	echo PYTHIA8DATA=/usr/share/${PN}/xmldoc >> 99pythia8
+	doenvd 99pythia8
+
+	insinto /usr/share/doc/${PF}
+	dodoc GUIDELINES AUTHORS README
+	if use doc; then
+		doins worksheet.pdf || die "doc install failed"
+		mv htmldoc html
+		doins -r html || die "html doc install failed"
+	fi
+	if use examples; then
+		doins -r examples || die "examples install failed"
+	fi
+}