diff --git a/sys-devel/rust-std/Manifest b/sys-devel/rust-std/Manifest
index ee3c2e4f474a7..09fa5e9842ed4 100644
--- a/sys-devel/rust-std/Manifest
+++ b/sys-devel/rust-std/Manifest
@@ -18,6 +18,8 @@ DIST rustc-1.89.0-src.tar.xz 267487572 BLAKE2B 9f6e3c595f843c239b57f14e26685e985
 DIST rustc-1.89.0-src.tar.xz.asc 801 BLAKE2B cd94da916d3646048d8f90c6de658de2981d0c815a1f8da01fe58ab6ec133e47180c8b506a41e22c68b3cb77aff5bd3bfc966a71ae2b73849918096d68764386 SHA512 006b91bf41fbedf91c39b8a6e483b089f69af7e78026f2903928fed64e44ee6aa53e46fd19bae31b1576b53a80dab66bf3e53a3bf79f820066d36285d706b90c
 DIST rustc-1.90.0-src.tar.xz 272348992 BLAKE2B 82dbbe3b5fe79f623c74fb81a4c4372b14e7d765f0e9af3d76a6c4bde9899007c85c8af70dfd9facc06c37a9c8d03a4597ec87b2d053585ccbc2287332b27e70 SHA512 fb0798b4c7450754db2fcbb641202909d209c6db2d9181d7df7282217b8320dc52f5e9853de9d7bdb79177f1f920389450cab07674dea5fb5501eaab5816662a
 DIST rustc-1.90.0-src.tar.xz.asc 801 BLAKE2B 1e84c6134c4fedbbd52610c259c1bdacb45bc97e8cce7a6b5a8c92827a072c88fcf8984893a5e6aa28c2d5d82bd849bb9d38390c783cfaa503a18c99bcaabcde SHA512 fc8f6dfbb4b50777ae8e499883f95b64861db0ca37119b34b3670b4adf51dd248b0b33daafee90e0f22f66b1d8bd8ae6a6107106e95e73f5c2c5a8dc29532e2e
+DIST rustc-1.91.0-src.tar.xz 270987196 BLAKE2B 18ea8075c288d1c2cc8c247120ae5fa157d0144f6dc8f0e30ce48eb068b2440604733b5230fcea6fcb9aa4630de03aa4af632227c5f3e62733254ee45e2a478d SHA512 1e4c7a2435dc5bccfc63f34f5d210f7cafb0113787a4b5069d61f03528a32cd0a29ac516673cbc0eb564089f1dc5e13b962e6c3714bd0109de664c22ed340fb3
+DIST rustc-1.91.0-src.tar.xz.asc 801 BLAKE2B 11b157fafcfa9887b591ffff8b87641f62e81e44d32d5c4ae99a410179905ae64fe760d6c3a6614bd479f51457542a57b171aaa53baad73d5030e496e62f1e67 SHA512 17c99b273d7e84c54b40817448cb7f543b61a5b262d2bfb1c2d1ff108ccf010295c42ae1ae74593fdab1d6caa3cd3f6713e9966a9a5057c01cd85ae3f24a6f89
 DIST rustc-1.91.0_beta20250928-src.tar.xz 284030160 BLAKE2B f5df2137e3a08b51f034543d1bcd0793f7d29264e81926458f6071c6f2de4093170ec5d257e56a9940b10494642eab9e57bffd24d61e8682ff052bd62517543b SHA512 e2ea6676f01b35cbd632c7a36d53b8d6d1e02a74fa460243575036b99406781416629300fef58ae04dffa8ed40f5448ca167654fb14db6676d57fc6cc2b31481
 DIST rustc-1.91.0_beta20250928-src.tar.xz.asc 801 BLAKE2B 70c58b0eb97b735835c37060e2e1ed13ed3531355cf36006c33ba5dbed2f252bda6900e4846693146fd8a093dd3b523a653166588ed1335fb22736e2e5a46567 SHA512 07eed611a38290582329512667d88cfb22d30119d9947169337844534bdbe9113f048080fbfa4dce95e3132319053919c6b11254c6e259cdaed788fa5ac777df
 DIST rustc-1.91.0_beta20251009-src.tar.xz 270944196 BLAKE2B 5fd9843a4fb23a56e1bc6d3b815d8dca2d350006337c3626dc782b06f7eb1da0a427056f37a9b9cf06e16d55381edad37c2528f52cef31f05fb058967220d793 SHA512 7923188c85c9635700e046f0ebc1f8391ed500461537e20f6db5272fa13dcf980d67c329e2b9ef4cc4137a696784b84d4b05acbea37af6939a8844f95be2feb3
diff --git a/sys-devel/rust-std/rust-std-1.91.0.ebuild b/sys-devel/rust-std/rust-std-1.91.0.ebuild
new file mode 100644
index 0000000000000..d3494b3678466
--- /dev/null
+++ b/sys-devel/rust-std/rust-std-1.91.0.ebuild
@@ -0,0 +1,179 @@
+# Copyright 2020-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{11..13} )
+
+inherit edo flag-o-matic multiprocessing python-any-r1 rust-toolchain toolchain-funcs verify-sig
+
+DESCRIPTION="Rust standard library, standalone (for crossdev)"
+HOMEPAGE="https://www.rust-lang.org"
+
+if [[ ${PV} = *9999* ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/rust-lang/rust.git"
+	EGIT_SUBMODULES=(
+			"*"
+			"-src/gcc"
+	)
+elif [[ ${PV} == *beta* ]]; then
+	# Identify the snapshot date of the beta release:
+	# curl -Ls static.rust-lang.org/dist/channel-rust-beta.toml | grep beta-src.tar.xz
+	betaver=${PV//*beta}
+	BETA_SNAPSHOT="${betaver:0:4}-${betaver:4:2}-${betaver:6:2}"
+	MY_P="rustc-beta"
+	SRC_URI="https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz -> rustc-${PV}-src.tar.xz
+			verify-sig? ( https://static.rust-lang.org/dist/${BETA_SNAPSHOT}/rustc-beta-src.tar.xz.asc
+					-> rustc-${PV}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/${MY_P}-src"
+else
+	MY_P="rustc-${PV}"
+	SRC_URI="https://static.rust-lang.org/dist/${MY_P}-src.tar.xz
+			verify-sig? ( https://static.rust-lang.org/dist/${MY_P}-src.tar.xz.asc )
+	"
+	S="${WORKDIR}/${MY_P}-src"
+fi
+
+LICENSE="|| ( MIT Apache-2.0 ) BSD-1 BSD-2 BSD-4"
+SLOT="stable/$(ver_cut 1-2)"
+# please do not keyword
+#KEYWORDS="" #nowarn
+IUSE="debug"
+
+BDEPEND="
+	${PYTHON_DEPS}
+	~dev-lang/rust-${PV}:=
+	verify-sig? ( sec-keys/openpgp-keys-rust )
+"
+DEPEND="||
+	(
+		>="${CATEGORY}"/gcc-4.7:*
+		>="${CATEGORY/sys-devel/llvm-core}"/clang-3.5:*
+	)
+"
+RDEPEND="${DEPEND}"
+
+# need full compiler to run tests
+RESTRICT="test"
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/rust.asc
+
+QA_FLAGS_IGNORED="usr/lib/rust/${PV}/rustlib/.*/lib/lib.*.so"
+
+#
+# The cross magic
+#
+export CTARGET=${CTARGET:-${CHOST}}
+if [[ ${CTARGET} == ${CHOST} ]] ; then
+	if [[ ${CATEGORY} == cross-* ]] ; then
+		export CTARGET=${CATEGORY#cross-}
+	fi
+fi
+
+is_cross() {
+	[[ ${CHOST} != ${CTARGET} ]]
+}
+
+toml_usex() {
+	usex "$1" true false
+}
+
+pkg_pretend() {
+	is_cross || die "${PN} should only be used for cross"
+}
+
+pkg_setup() {
+	python-any-r1_pkg_setup
+}
+
+src_prepare() {
+	default
+}
+
+src_configure() {
+	# do the great cleanup
+	strip-flags
+	filter-flags '-mcpu=*' '-march=*' '-mtune=*' '-m32' '-m64'
+	strip-unsupported-flags
+
+	local rust_root x
+	rust_root="$(rustc --print sysroot)"
+	rtarget="$(rust_abi ${CTARGET})"
+	rtarget="${ERUST_STD_RTARGET:-${rtarget}}" # some targets need to be custom.
+	rbuild="$(rust_abi ${CBUILD})"
+	rhost="$(rust_abi ${CHOST})"
+
+	echo
+	for x in CATEGORY rust_root rbuild rhost rtarget RUSTFLAGS CFLAGS CXXFLAGS LDFLAGS; do
+		einfo "$(printf '%10s' ${x^^}:) ${!x}"
+	done
+
+	cat <<- EOF > "${S}"/bootstrap.toml
+		[build]
+		build = "${rbuild}"
+		host = ["${rhost}"]
+		target = ["${rtarget}"]
+		cargo = "${rust_root}/bin/cargo"
+		rustc = "${rust_root}/bin/rustc"
+		submodules = false
+		python = "${EPYTHON}"
+		locked-deps = true
+		vendor = true
+		extended = true
+		verbose = 2
+		cargo-native-static = false
+		[install]
+		prefix = "${EPREFIX}/usr/lib/${PN}/${PV}"
+		sysconfdir = "etc"
+		docdir = "share/doc/rust"
+		bindir = "bin"
+		libdir = "lib"
+		mandir = "share/man"
+		[rust]
+		# https://github.com/rust-lang/rust/issues/54872
+		codegen-units-std = 1
+		optimize = true
+		debug = $(toml_usex debug)
+		debug-assertions = $(toml_usex debug)
+		debuginfo-level-rustc = 0
+		backtrace = true
+		incremental = false
+		default-linker = "$(tc-getCC)"
+		rpath = false
+		dist-src = false
+		remap-debuginfo = true
+		jemalloc = false
+		[dist]
+		src-tarball = false
+		[target.${rtarget}]
+		ar = "$(tc-getAR ${CTARGET})"
+		cc = "$(tc-getCC ${CTARGET})"
+		cxx = "$(tc-getCXX ${CTARGET})"
+		linker = "$(tc-getCC ${CTARGET})"
+		ranlib = "$(tc-getRANLIB ${CTARGET})"
+		$(usev elibc_musl 'crt-static = false')
+	EOF
+
+	einfo "${PN^} configured with the following settings:"
+	cat "${S}"/bootstrap.toml || die
+}
+
+src_compile() {
+	edo env RUST_BACKTRACE=1 \
+		"${EPYTHON}" ./x.py build -vv --config="${S}"/bootstrap.toml -j$(makeopts_jobs) \
+		library/std --stage 0
+}
+
+src_test() {
+	ewarn "${PN} can't run tests"
+}
+
+src_install() {
+	local rustlib="lib/rust/${PV}/lib/rustlib"
+	dodir "/usr/${rustlib}"
+	pushd "build/${rhost}/stage0-sysroot/lib/rustlib" > /dev/null || die
+	cp -pPRv "${rtarget}" "${ED}/usr/${rustlib}" || die
+	popd > /dev/null || die
+}