diff --git a/sci-physics/rivet/metadata.xml b/sci-physics/rivet/metadata.xml
index 7b76411f729ac..3c3d7657ceeca 100644
--- a/sci-physics/rivet/metadata.xml
+++ b/sci-physics/rivet/metadata.xml
@@ -16,8 +16,6 @@
 	</longdescription>
 	<use>
 		<flag name="zlib">Build with <pkg>virtual/zlib</pkg></flag>
-		<flag name="hepmc3">Build with <pkg>sci-physics/hepmc</pkg> version 3</flag>
-		<flag name="hepmc2">Build with <pkg>sci-physics/hepmc</pkg> version 2</flag>
 		<flag name="highfive">Build with <pkg>sci-libs/highfive</pkg> and <pkg>sci-libs/hdf5</pkg></flag>
 	</use>
 	<upstream>
diff --git a/sci-physics/rivet/rivet-3.1.11.ebuild b/sci-physics/rivet/rivet-3.1.11.ebuild
deleted file mode 100644
index db8a89394ac20..0000000000000
--- a/sci-physics/rivet/rivet-3.1.11.ebuild
+++ /dev/null
@@ -1,115 +0,0 @@
-# Copyright 2022-2025 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-PYTHON_COMPAT=( python3_{11..13} )
-
-inherit python-single-r1 flag-o-matic autotools optfeature bash-completion-r1
-
-MY_PN="Rivet"
-MY_PF=${MY_PN}-${PV}
-
-DESCRIPTION="Rivet toolkit (Robust Independent Validation of Experiment and Theory)"
-HOMEPAGE="
-	https://rivet.hepforge.org/
-	https://gitlab.com/hepcedar/rivet
-"
-if [[ ${PV} == 9999 ]]; then
-	inherit git-r3
-	EGIT_REPO_URI="https://gitlab.com/hepcedar/rivet"
-else
-	SRC_URI="https://www.hepforge.org/archive/rivet/${MY_PF}.tar.gz -> ${P}.tar.gz"
-	S=${WORKDIR}/${MY_PF}
-	KEYWORDS="~amd64"
-fi
-
-LICENSE="GPL-3+"
-SLOT="4/${PV}"
-IUSE="+hepmc3 hepmc2 +zlib +python"
-REQUIRED_USE="
-	^^ ( hepmc3 hepmc2 )
-	python? ( ${PYTHON_REQUIRED_USE} )
-"
-
-RDEPEND="
-	>=sci-physics/fastjet-3.4.0[plugins]
-	>=sci-physics/fastjet-contrib-1.048
-	hepmc2? ( sci-physics/hepmc:2=[-cm(-),gev(+)] )
-	hepmc3? ( <sci-physics/hepmc-3.3.0:3=[-cm(-),gev(+)] )
-
-	sci-libs/gsl
-	zlib? ( virtual/zlib:= )
-	python? (
-		${PYTHON_DEPS}
-		$(python_gen_cond_dep '
-			dev-python/matplotlib[${PYTHON_USEDEP}]
-		')
-		>=sci-physics/yoda-1.9.8[${PYTHON_SINGLE_USEDEP}]
-		<sci-physics/yoda-2[${PYTHON_SINGLE_USEDEP}]
-	)
-	!python? (
-		>=sci-physics/yoda-1.9.8
-		<sci-physics/yoda-2
-	)
-	!sci-physics/rivet:3
-"
-DEPEND="${RDEPEND}"
-BDEPEND="
-	app-shells/bash
-	python? (
-		$(python_gen_cond_dep '
-			>=dev-python/cython-0.29.24[${PYTHON_USEDEP}]
-		')
-	)
-"
-
-PATCHES=(
-	"${FILESDIR}"/${PN}-3.1.6-binreloc.patch
-	"${FILESDIR}"/${PN}-3.1.9-pythontests.patch
-)
-
-pkg_setup() {
-	use python && python-single-r1_pkg_setup
-}
-
-src_prepare() {
-	default
-	eautoreconf
-}
-
-src_configure() {
-	# Eigen complains about alignment (see https://gitlab.com/libeigen/eigen/-/issues/2523).
-	# does this affect more cpus?
-	replace-cpu-flags znver1 x86-64
-	# not posix compatible, only bash
-	CONFIG_SHELL=${ESYSROOT}/bin/bash econf \
-		$(use_with zlib zlib "${ESYSROOT}/usr") \
-		$(usex hepmc2 "--with-hepmc=${ESYSROOT}/usr" "") \
-		$(usex hepmc3 "--with-hepmc3=${ESYSROOT}/usr" "") \
-		--with-yoda="${ESYSROOT}/usr" \
-		--with-fastjet="${ESYSROOT}/usr" \
-		$(use_enable python pyext) \
-		$(usex python CYTHON="${ESYSROOT}/usr/bin/cython")
-}
-
-src_install() {
-	default
-	use python && python_optimize
-	find "${ED}" -name '*.la' -delete || die
-	if use python ; then
-		newbashcomp "${ED}"/etc/bash_completion.d/${PN}-completion ${PN}
-		bashcomp_alias ${PN} ${PN}-config \
-			${PN}-build \
-			${PN}-buildplugin \
-			${PN}-cmphistos \
-			make-plots \
-			${PN}-mkhtml \
-			${PN}-mkhtml-mpl
-		rm "${ED}"/etc/bash_completion.d/${PN}-completion || die
-	fi
-}
-
-pkg_postinstall() {
-	optfeature "plotting support" virtual/latex-base media-gfx/imagemagick app-text/ghostscript-gpl
-}