diff --git a/dev-libs/boost/boost-1.90.0-r1.ebuild b/dev-libs/boost/boost-1.90.0-r1.ebuild
deleted file mode 100644
index f4c81e6beecc2..0000000000000
--- a/dev-libs/boost/boost-1.90.0-r1.ebuild
+++ /dev/null
@@ -1,477 +0,0 @@
-# Copyright 1999-2026 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-# Keep an eye on releases: https://www.boost.org/releases/
-
-PYTHON_COMPAT=( python3_{11..14} )
-
-inherit dot-a edo flag-o-matic multiprocessing python-r1 toolchain-funcs multilib-minimal
-
-MY_PV="$(ver_rs 1- _)"
-
-DESCRIPTION="Boost Libraries for C++"
-HOMEPAGE="https://www.boost.org/"
-SRC_URI="https://archives.boost.io/release/${PV}/source/boost_${MY_PV}.tar.bz2"
-S="${WORKDIR}/${PN}_${MY_PV}"
-
-LICENSE="Boost-1.0"
-SLOT="0/${PV}"
-KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~arm64-macos ~x64-macos ~x64-solaris"
-IUSE="bzip2 +context debug doc icu lzma +nls mpi numpy python +stacktrace test test-full tools zlib zstd"
-REQUIRED_USE="
-	python? ( ${PYTHON_REQUIRED_USE} )
-	test-full? ( test )
-"
-RESTRICT="!test? ( test )"
-
-RDEPEND="
-	bzip2? ( app-arch/bzip2:=[${MULTILIB_USEDEP}] )
-	icu? ( dev-libs/icu:=[${MULTILIB_USEDEP}] )
-	!icu? ( virtual/libiconv[${MULTILIB_USEDEP}] )
-	lzma? ( app-arch/xz-utils:=[${MULTILIB_USEDEP}] )
-	mpi? ( virtual/mpi[${MULTILIB_USEDEP},threads] )
-	python? (
-		${PYTHON_DEPS}
-		numpy? ( dev-python/numpy:=[${PYTHON_USEDEP}] )
-	)
-	zlib? ( virtual/zlib:=[${MULTILIB_USEDEP}] )
-	zstd? ( app-arch/zstd:=[${MULTILIB_USEDEP}] )"
-DEPEND="${RDEPEND}"
-BDEPEND=">=dev-build/b2-5.1.0"
-
-PATCHES=(
-	"${FILESDIR}"/${PN}-1.88.0-disable_icu_rpath.patch
-	"${FILESDIR}"/${PN}-1.88.0-build-auto_index-tool.patch
-	"${FILESDIR}"/${PN}-1.88.0-algorithm-reverse_copy.patch
-	"${FILESDIR}"/${PN}-1.88.0-beast-network-sandbox.patch
-	"${FILESDIR}"/${PN}-1.88.0-bind-no-Werror.patch
-	"${FILESDIR}"/${PN}-1.88.0-range-any_iterator.patch
-	"${FILESDIR}"/${PN}-1.88.0-system-crashing-test.patch
-	"${FILESDIR}"/${PN}-1.88.0-yap-cstdint.patch
-	# https://github.com/boostorg/dll/issues/108
-	"${FILESDIR}"/${PN}-1.89.0-dll-no-lto.patch
-	"${FILESDIR}"/${PN}-1.89.0-graph-remove-system-dependency.patch
-	"${FILESDIR}"/${PN}-1.89.0-predef-include-path.patch
-	"${FILESDIR}"/${PN}-1.89.0-python-exclude-broken-tests.patch
-	"${FILESDIR}"/${PN}-1.89.0-unordered-no-tbb.patch
-	"${FILESDIR}"/${PN}-1.90.0-msm-std.patch
-	"${FILESDIR}"/${PN}-1.90.0-unsigned-char-EOF.patch
-)
-
-create_user-config.jam() {
-	local user_config_jam="${BUILD_DIR}"/user-config.jam
-	if [[ -s ${user_config_jam} ]]; then
-		einfo "${user_config_jam} already exists, skipping configuration"
-		return
-	else
-		einfo "Creating configuration in ${user_config_jam}"
-	fi
-
-	local compiler compiler_version compiler_executable="$(tc-getCXX)"
-	compiler="gcc"
-	compiler_version="$(gcc-version)"
-
-	if use mpi; then
-		local mpi_configuration="using mpi ;"
-	fi
-
-	cat > "${user_config_jam}" <<- __EOF__ || die
-		using ${compiler} : ${compiler_version} : ${compiler_executable} : <cflags>"${CPPFLAGS} ${CFLAGS}" <cxxflags>"${CPPFLAGS} ${CXXFLAGS}" <linkflags>"${LDFLAGS}" <archiver>"$(tc-getAR)" <ranlib>"$(tc-getRANLIB)" ;
-		${mpi_configuration}
-	__EOF__
-
-	if multilib_native_use python; then
-		append_to_user_config() {
-			local py_config
-			if tc-is-cross-compiler; then
-				py_config="using python : ${EPYTHON#python} : : ${ESYSROOT}/usr/include/${EPYTHON} : ${ESYSROOT}/usr/$(get_libdir) ;"
-			else
-				py_config="using python : ${EPYTHON#python} : ${PYTHON} : $(python_get_includedir) ;"
-			fi
-			echo "${py_config}" >> "${user_config_jam}" || die
-		}
-		python_foreach_impl append_to_user_config
-	fi
-
-	if multilib_native_use python && use numpy; then
-		einfo "Enabling support for NumPy extensions in Boost.Python"
-	else
-		einfo "Disabling support for NumPy extensions in Boost.Python"
-
-		# Boost.Build does not allow for disabling of numpy
-		# extensions, thereby leading to automagic numpy
-		# https://github.com/boostorg/python/issues/111#issuecomment-280447482
-		sed \
-			-e 's/\[ unless \[ python\.numpy \] : <build>no \]/<build>no/g' \
-			-i "${BUILD_DIR}"/libs/python/build/Jamfile || die
-	fi
-}
-
-pkg_setup() {
-	# Bail out on unsupported build configuration, bug #456792
-	if [[ -f "${EROOT}"/etc/site-config.jam ]]; then
-		if ! grep -q 'gentoo\(debug\|release\)' "${EROOT}"/etc/site-config.jam; then
-			eerror "You are using custom ${EROOT}/etc/site-config.jam without defined gentoorelease/gentoodebug targets."
-			eerror "Boost can not be built in such configuration."
-			eerror "Please, either remove this file or add targets from ${EROOT}/usr/share/boost-build/site-config.jam to it."
-			die "Unsupported target in ${EROOT}/etc/site-config.jam"
-		fi
-	fi
-}
-
-src_prepare() {
-	default
-	multilib_copy_sources
-}
-
-ejam() {
-	create_user-config.jam
-
-	local b2_opts=( "--user-config=${BUILD_DIR}/user-config.jam" )
-	if multilib_native_use python; then
-		append_to_b2_opts() {
-			b2_opts+=( python="${EPYTHON#python}" )
-		}
-		python_foreach_impl append_to_b2_opts
-	else
-		b2_opts+=( --without-python )
-	fi
-	b2_opts+=( "$@" )
-
-	echo b2 "${b2_opts[@]}" >&2
-	b2 "${b2_opts[@]}"
-}
-
-src_configure() {
-	# -Werror=odr
-	# https://bugs.gentoo.org/943975
-	# https://github.com/boostorg/quickbook/issues/27
-	# https://github.com/boostorg/spirit/issues/800
-	#
-	# Tests also fail:
-	# https://bugs.gentoo.org/956660
-	# https://github.com/boostorg/smart_ptr/issues/121
-	# https://github.com/boostorg/thread/issues/415
-	filter-lto
-
-	lto-guarantee-fat
-
-	# Workaround for too many parallel processes requested, bug #506064
-	[[ "$(makeopts_jobs)" -gt 64 ]] && MAKEOPTS="${MAKEOPTS} -j64"
-
-	# We don't want to end up with -L/usr/lib on our linker lines
-	# which then gives us lots of
-	#   skipping incompatible /usr/lib/libc.a when searching for -lc
-	# warnings
-	[[ -n ${ESYSROOT} ]] && local icuarg="-sICU_PATH=${ESYSROOT}/usr"
-
-	OPTIONS=(
-		$(usex debug gentoodebug gentoorelease)
-		"-j$(makeopts_jobs)"
-		-q
-		-d+2
-		pch=off
-		$(usex icu "${icuarg}" '--disable-icu boost.locale.icu=off')
-		$(usev !mpi --without-mpi)
-		$(usev !nls --without-locale)
-		$(usev !context '--without-context --without-coroutine --without-fiber')
-		$(usev !stacktrace --without-stacktrace)
-		--boost-build="${BROOT}"/usr/share/b2/src
-		--layout=system
-		# building with threading=single is currently not possible
-		# https://svn.boost.org/trac/boost/ticket/7105
-		threading=multi
-		link=shared
-		# this seems to be the only way to disable compression algorithms
-		# https://www.boost.org/doc/libs/1_70_0/libs/iostreams/doc/installation.html#boost-build
-		-sNO_BZIP2=$(usex bzip2 0 1)
-		-sNO_LZMA=$(usex lzma 0 1)
-		-sNO_ZLIB=$(usex zlib 0 1)
-		-sNO_ZSTD=$(usex zstd 0 1)
-		boost.stacktrace.from_exception=off
-	)
-
-	if [[ ${CHOST} == *-darwin* ]]; then
-		# We need to add the prefix, and in two cases this exceeds, so prepare
-		# for the largest possible space allocation.
-		append-ldflags -Wl,-headerpad_max_install_names
-	fi
-
-	# Use C++17 globally as of 1.80
-	append-cxxflags -std=c++17
-
-	if [[ ${CHOST} != *-darwin* ]]; then
-		# On modern macOS, file I/O is already 64-bit by default,
-		# there's no support for special options like O_LARGEFILE.
-		# Thus, LFS must be disabled.
-		#
-		# On other systems, we need to enable LFS explicitly for 64-bit
-		# offsets on 32-bit hosts (#894564)
-		append-lfs-flags
-	fi
-}
-
-multilib_src_compile() {
-	ejam \
-		--prefix="${EPREFIX}"/usr \
-		"${OPTIONS[@]}" || die
-
-	if multilib_native_use tools; then
-		pushd tools >/dev/null || die
-		ejam \
-			--prefix="${EPREFIX}"/usr \
-			"${OPTIONS[@]}" \
-			|| die "Building of Boost tools failed"
-		popd >/dev/null || die
-	fi
-}
-
-multilib_src_test() {
-	##
-	## Test exclusions
-	##
-
-	# The following libraries do not compile or fail their tests:
-	local libs_excluded=(
-		# it seems tests are no longer built
-		"callable_traits"
-		# test output comparison failure
-		"config"
-		# undefined reference to `boost::math::concepts::real_concept boost::math::bernoulli_b2n<boost::math::concepts::real_concept>(int)
-		"math"
-		# In function 'PyObject* boost::parameter::python::aux::unspecified_type()':
-		#  /usr/include/python3.13/object.h:339:30: error: lvalue required as left operand of assignment
-		#  #define Py_TYPE(ob) Py_TYPE(_PyObject_CAST(ob))
-		#                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~
-		"parameter_python"
-		# scope/lambda_tests22.cpp(27): test 'x == 1' failed in function 'int main()'
-		"phoenix"
-		# vec_access.hpp:95:223: error: static assertion failed: Boost QVM static assertion failure
-		"qvm"
-		# Processing file ../boost_1_89_0/libs/regex/example/../include/boost/regex/v5/regex_iterator.hpp
-		# terminate called after throwing an instance of 'std::length_error'
-		#   what():  basic_string::_M_create
-		"regex"
-		# in function `boost::archive::tmpnam(char*)': test_array.cpp:(.text+0x108):
-		#   undefined reference to `boost::filesystem::detail::unique_path(...)'
-		"serialization"
-		# TuTestMain.cpp(22) fatal error: in "test_main_caller( argc_ argv )":
-		#   std::runtime_error: Event was not consumed!
-		"statechart"
-		# t_5_007.cpp(22): error: could not find include file: boost/version.hpp
-		"wave"
-	)
-
-	if ! use mpi; then
-		# graph_parallel tries to use MPI even with use=-mpi
-		local no_mpi=( "mpi" "graph_parallel" )
-		einfo "Disabling tests due to USE=-mpi: ${no_mpi[@]}"
-		libs_excluded+=( ${no_mpi[@]} )
-	fi
-
-	if ! use test-full; then
-		# passes its tests but takes a very long time to build
-		local no_full=( "geometry" "multiprecision" )
-		einfo "Disabling expensive tests due to USE=-test-full: ${no_full[@]}"
-		libs_excluded+=( ${no_full[@]} )
-	fi
-
-	einfo "Skipping the following tests: ${libs_excluded[@]}"
-
-	##
-	## Find and run tests
-	##
-
-	# Prepare to find libraries but without exclusions
-	local excluded findlibs="find ${BUILD_DIR}/libs -maxdepth 1 -mindepth 1 -type d "
-	for excluded in ${libs_excluded[@]}; do
-	   findlibs+="-not -name ${excluded} "
-	done
-
-	# Must come as last argument
-	findlibs+="-print0"
-
-	# Collect libraries to test, with full path.
-	# The list is then sorted to provide predictable execution order,
-	# which would otherwise depend on the file system.
-	local libs
-	readarray -td '' libs < <(${findlibs})
-	readarray -td '' libs < <(printf '%s\0' "${libs[@]}" | sort -z)
-
-	# Build the list of test names we are about to run
-	local lib_names
-	for lib in ${libs[@]}; do
-		lib_names+=("${lib##*/}")
-	done
-
-	# Create custom options for tests based on the build settings
-	TEST_OPTIONS=("${OPTIONS[@]}")
-
-	# Dial down log output - the full b2 command used to compile & run
-	# a test suite will be printed by ejam and can be used to build
-	# and run the tests in a test suite's directory.
-	TEST_OPTIONS=("${TEST_OPTIONS[@]/-d+2/-d0}")
-
-	# Finally build & run all test suites
-	einfo "Running the following tests: ${lib_names[*]}"
-
-	local failed_tests=()
-	for lib in "${libs[@]}"; do
-		# Skip libraries without test directory
-		[[ ! -d "${lib}/test" ]] && continue
-
-		# Move into library test dir & run all tests
-		pushd "${lib}/test" >/dev/null || die
-		nonfatal edob -m "Running tests in: $(pwd)" ejam --prefix="${EPREFIX}"/usr "${TEST_OPTIONS[@]}" || failed_tests+=( "${lib}" )
-		popd >/dev/null || die
-	done
-
-	if (( ${#failed_tests[@]} )); then
-		eerror "Failed tests. Printing summary."
-		local failed_test
-		for failed_test in "${failed_tests[@]}" ; do
-			eerror "Failed test: ${failed_test}"
-		done
-		die "Tests failed."
-	fi
-}
-
-multilib_src_install() {
-	ejam \
-		--prefix="${ED}"/usr \
-		--includedir="${ED}"/usr/include \
-		--libdir="${ED}"/usr/$(get_libdir) \
-		"${OPTIONS[@]}" install || die "Installation of Boost libraries failed"
-
-	if multilib_native_use tools; then
-		dobin dist/bin/*
-
-		insinto /usr/share
-		doins -r dist/share/boostbook
-	fi
-
-	# boost's build system truely sucks for not having a destdir.  Because for
-	# this reason we are forced to build with a prefix that includes the
-	# DESTROOT, dynamic libraries on Darwin end messed up, referencing the
-	# DESTROOT instread of the actual EPREFIX.  There is no way out of here
-	# but to do it the dirty way of manually setting the right install_names.
-	if [[ ${CHOST} == *-darwin* ]]; then
-		einfo "Working around completely broken build-system(tm)"
-		local d
-		for d in "${ED}"/usr/lib/*.dylib; do
-			if [[ -f ${d} ]]; then
-				# fix the "soname"
-				ebegin "  correcting install_name of ${d#${ED}}"
-				install_name_tool -id "/${d#${D}}" "${d}"
-				eend $?
-				# fix references to other libs
-				# these paths look like this:
-				# bin.v2/libs/thread/build/gcc-12.1/gentoorelease/pch-off/
-				#  threadapi-pthread/threading-multi/visibility-hidden/
-				#  libboost_thread.dylib
-				refs=$(otool -XL "${d}" | \
-					sed -e '1d' -e 's/^\t//' | \
-					grep "libboost_" | \
-					cut -f1 -d' ')
-				local r
-				for r in ${refs}; do
-					# strip path prefix from references, so we obtain
-					# something like libboost_thread.dylib.
-					local r_basename=${r##*/}
-
-					ebegin "    correcting reference to ${r_basename}"
-					install_name_tool -change \
-						"${r}" \
-						"${EPREFIX}/usr/lib/${r_basename}" \
-						"${d}"
-					eend $?
-				done
-			fi
-		done
-	fi
-}
-
-multilib_src_install_all() {
-	if ! use numpy; then
-		rm -r "${ED}"/usr/include/boost/python/numpy* || die
-	fi
-
-	if use python; then
-		if use mpi; then
-			move_mpi_py_into_sitedir() {
-				python_moduleinto boost
-
-				python_domodule "${ED}"/usr/$(get_libdir)/boost-${EPYTHON}/mpi.so
-				rm -r "${ED}"/usr/$(get_libdir)/boost-${EPYTHON} || die
-
-				python_optimize
-			}
-			python_foreach_impl move_mpi_py_into_sitedir
-		else
-			rm -r "${ED}"/usr/include/boost/mpi/python* || die
-		fi
-	else
-		rm -r "${ED}"/usr/include/boost/{python*,mpi/python*,parameter/aux_/python,parameter/python*} || die
-	fi
-
-	if ! use nls; then
-		rm -r "${ED}"/usr/include/boost/locale || die
-	fi
-
-	if ! use context; then
-		rm -r "${ED}"/usr/include/boost/context || die
-		rm -r "${ED}"/usr/include/boost/coroutine{,2} || die
-		rm "${ED}"/usr/include/boost/asio/spawn.hpp || die
-	fi
-
-	if use doc; then
-		# find extraneous files that shouldn't be installed
-		# as part of the documentation and remove them.
-		find libs/*/* \( -iname 'test' -o -iname 'src' \) -exec rm -rf '{}' + || die
-		find doc \( -name 'Jamfile.v2' -o -name 'build' -o -name '*.manifest' \) -exec rm -rf '{}' + || die
-		find tools \( -name 'Jamfile.v2' -o -name 'src' -o -name '*.cpp' -o -name '*.hpp' \) -exec rm -rf '{}' + || die
-
-		docinto html
-		dodoc *.{htm,html,png,css}
-		dodoc -r doc libs more tools
-
-		# To avoid broken links
-		dodoc LICENSE_1_0.txt
-
-		dosym ../../../../include/boost /usr/share/doc/${PF}/html/boost
-	fi
-
-	strip-lto-bytecode
-}
-
-pkg_preinst() {
-	# Yay for having symlinks that are nigh-impossible to remove without
-	# resorting to dirty hacks like these. Removes lingering symlinks
-	# from the slotted versions.
-	local symlink
-	for symlink in "${EROOT}"/usr/include/boost "${EROOT}"/usr/share/boostbook; do
-		if [[ -L ${symlink} ]]; then
-			rm -f "${symlink}" || die
-		fi
-	done
-
-	# some ancient installs still have boost cruft lying around
-	# for unknown reasons, causing havoc for reverse dependencies
-	# Bug: 607734
-	rm -rf "${EROOT}"/usr/include/boost-1_[3-5]? || die
-}
-
-pkg_postinst() {
-	elog "Boost.Regex is *extremely* ABI sensitive. If you get errors such as"
-	elog
-	elog "  undefined reference to \`boost::re_detail_$(ver_cut 1)0$(ver_cut 2)00::cpp_regex_traits_implementation"
-	elog "    <char>::transform_primary[abi:cxx11](char const*, char const*) const'"
-	elog
-	elog "Then you need to recompile Boost and all its reverse dependencies"
-	elog "using the same toolchain. In general, *every* change of the C++ toolchain"
-	elog "requires a complete rebuild of the Boost-dependent ecosystem."
-	elog
-	elog "See for instance https://bugs.gentoo.org/638138"
-}