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diff --git a/sci-physics/pythia/pythia-8.2.26-r1.ebuild b/sci-physics/pythia/pythia-8.2.26-r1.ebuild
new file mode 100644
index 000000000000..3c735682cf15
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+++ b/sci-physics/pythia/pythia-8.2.26-r1.ebuild
@@ -0,0 +1,188 @@
+# Copyright 1999-2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit toolchain-funcs
+
+MV=$(ver_cut 1)
+MY_P="${PN}${PV//./}"
+LHA_VER="6.1"
+
+DESCRIPTION="Lund Monte Carlo high-energy physics event generator"
+HOMEPAGE="http://pythia8.hepforge.org/"
+SRC_URI="http://home.thep.lu.se/~torbjorn/${PN}${MV}/${MY_P}.tgz
+	test? ( lhapdf? (
+		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/CT10.tar.gz
+		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/MRST2007lomod.tar.gz
+		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/NNPDF23_nlo_as_0119_qed_mc.tar.gz
+		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/NNPDF23_nnlo_as_0119_qed_mc.tar.gz
+		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/cteq66.tar.gz
+		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/cteq6l1.tar.gz
+		https://www.hepforge.org/archive/lhapdf/pdfsets/${LHA_VER}/unvalidated/MRST2004qed.tar.gz
+	) )"
+
+SLOT="8"
+LICENSE="GPL-2"
+KEYWORDS="~amd64 ~x86 ~amd64-linux ~x86-linux"
+IUSE="doc examples fastjet gzip +hepmc lhapdf root test"
+RESTRICT="!test? ( test )"
+
+RDEPEND="
+	fastjet? ( sci-physics/fastjet )
+	gzip? ( sys-libs/zlib )
+	hepmc? ( sci-physics/hepmc:0= )
+	lhapdf? ( sci-physics/lhapdf:= )"
+# ROOT is used only when building related tests
+DEPEND="${RDEPEND}
+	test? (
+		root? ( sci-physics/root:= )
+	)"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-run-tests.patch
+	"${FILESDIR}"/${PN}8209-root-noninteractive.patch
+)
+
+S="${WORKDIR}/${MY_P}"
+
+pkg_pretend() {
+	if use root && ! use test; then
+		ewarn "ROOT support will only affect examples code build during test stage."
+		ewarn "Since you have tests disabled, this is a no-op."
+	fi
+}
+
+src_prepare() {
+	PYTHIADIR="/usr/share/pythia8"
+	EPYTHIADIR="${EPREFIX}${PYTHIADIR}"
+
+	default
+	# set datadir for xmldor in include file
+	sed -i \
+		-e "s:../share/Pythia8/xmldoc:${EPYTHIADIR}/xmldoc:" \
+		include/Pythia8/Pythia.h || die
+	# respect libdir, prefix, flags
+	sed -i \
+		-e "s:/lib:/$(get_libdir):g" \
+		-e "s:/usr:${EPREFIX}/usr:g" \
+		-e "s:-O2:${CXXFLAGS}:g" \
+		-e "s:Cint:Core:g" \
+		configure || die
+	sed -i 's:$(CXX) $^ -o $@ $(CXX_COMMON) $(CXX_SHARED):$(CXX) $(LDFLAGS) $^ -o $@ $(CXX_COMMON) $(CXX_SHARED):g' \
+		Makefile || die
+	sed -i 's:$(CXX):$(CXX) $(LDFLAGS):' examples/Makefile || die
+	# we use lhapdf6 instead of lhapdf5
+	# some PDFs changed, use something similar
+	sed -i \
+		-e "s:LHAPDF5:LHAPDF6:g" \
+		-e "s:\.LHgrid::g" \
+		-e "s:\.LHpdf::g" \
+		-e "s:MRST2001lo:MRST2007lomod:g" \
+		-e "s:cteq6ll:cteq6l1:g" \
+		-e "s:cteq6m:cteq66:g" \
+		examples/*.{cc,cmnd} || die
+	# After lhapdf5->6 migration PDFs are identical within ~1/1000
+	# https://www.hepforge.org/archive/lhapdf/pdfsets/6.1/README
+	sed -i \
+		-e "s:1e-8:3e-1:g" \
+		-e "s:nlo_as_0119_qed:nlo_as_0119_qed_mc:g" \
+		-e "s:xmldoc:share/Pythia8/xmldoc:g" \
+		examples/main54.cc || die
+	# ask cflags from root
+	sed -i "s:root-config:root-config --cflags:g" examples/Makefile || die
+
+	sed -i \
+		-e '/TARGETS=$(LOCAL_LIB)\/libpythia8\.a/d' \
+		-e 's:libpythia8\.a$:libpythia8$(LIB_SUFFIX):g' \
+		Makefile || die
+	sed -i 's:libpythia8\.a:libpythia8$(LIB_SUFFIX):g' \
+		examples/Makefile || die
+}
+
+# TODO: the following optional packages are out of Gentoo tree:
+# - EvtGen http://atlas-computing.web.cern.ch/atlas-computing/links/externalDirectory/EvtGen/
+# - PowHEG http://powhegbox.mib.infn.it/
+# - ProMC  https://github.com/Argonne-National-Laboratory/ProMC/
+src_configure() {
+	# homemade configure script
+	./configure \
+		--arch=Linux \
+		--cxx=$(tc-getCXX) \
+		--enable-shared \
+		--prefix="${EPREFIX}/usr" \
+		--prefix-lib="$(get_libdir)" \
+		--prefix-share="${EPYTHIADIR}" \
+		$(usex fastjet "--with-fastjet3" "") \
+		$(usex gzip "--with-gzip" "") \
+		$(usex hepmc "--with-hepmc2" "") \
+		$(usex lhapdf "--with-lhapdf6
+			--with-lhapdf6-plugin=LHAPDF6.h
+			--with-lhapdf6-lib=${EPREFIX}/usr/$(get_libdir)" "") \
+		$(usex root "--with-root
+			--with-root-include=${EPREFIX}/usr/include/root
+			--with-root-lib=${EPREFIX}/usr/$(get_libdir)/root" "") \
+		|| die
+
+	# fix pythia config script
+	sed -i \
+		-e 's:pythia8/examples/Makefile.inc:pythia8/Makefile.inc:' \
+		-e 's:LINE%=:LINE%%=:' \
+		bin/pythia8-config || die
+}
+
+src_test() {
+	cd examples || die
+
+	local tests="$(echo main{{01..32},37,38,61,62,73,80}.out)"
+	use hepmc && tests+=" $(echo main{41,42,85,86}.out)"
+	use hepmc && use lhapdf && tests+=" $(echo main{43,{87..89}}.out)"
+	use lhapdf && tests+=" $(echo main{51..54}.out)"
+	use fastjet && tests+=" $(echo main{71,72}.out)"
+	use fastjet && use hepmc && use lhapdf && tests+=" $(echo main{81..84}).out"
+	use root && tests+=" main91.out"
+	# Disabled tests:
+	# 33	needs PowHEG
+	# 46	needs ProMC
+	# 48	needs EvtGen
+	# 92	generated ROOT dictionary is badly broken
+
+	# use emake for parallel instead of long runmains
+	LD_LIBRARY_PATH="${S}/$(get_libdir):${LD_LIBRARY_PATH}" \
+	PYTHIA8DATA="../share/Pythia8/xmldoc/" \
+	LHAPDF_DATA_PATH="${WORKDIR}" \
+	emake ${tests}
+	emake clean
+}
+
+src_install() {
+	# make install is too broken, much easier to install manually
+	dobin bin/pythia8-config
+	doheader -r include/*
+	dolib.so lib/libpythia8.so
+	insinto "${PYTHIADIR}"
+	doins -r share/Pythia8/xmldoc examples/Makefile.inc
+
+	newenvd - 99pythia8 <<- _EOF_
+		PYTHIA8DATA=${EPYTHIADIR}/xmldoc
+	_EOF_
+
+	dodoc AUTHORS GUIDELINES README
+	if use doc; then
+		dodoc -r share/Pythia8/pdfdoc/.
+		dodoc -r share/Pythia8/htmldoc/.
+	fi
+	if use examples; then
+		# reuse system Makefile.inc
+		rm examples/Makefile.inc || die
+		sed -i "s:include Makefile.inc:include ${EPYTHIADIR}:" \
+			examples/Makefile || die
+
+		insinto /usr/share/${PN}
+		doins -r examples
+		docompress -x /usr/share/doc/${PF}/examples
+	fi
+
+	# cleanup
+	unset PYTHIADIR EPYTHIADIR
+}