diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/Manifest b/sdk_container/src/third_party/portage-stable/net-misc/curl/Manifest
index 8d7ac6d5bb..c2701e8afb 100644
--- a/sdk_container/src/third_party/portage-stable/net-misc/curl/Manifest
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/Manifest
@@ -6,3 +6,7 @@ DIST curl-8.14.1.tar.xz 2817248 BLAKE2B 4ce2277d143084823855b714e86047a94d4c52a6
 DIST curl-8.14.1.tar.xz.asc 488 BLAKE2B f664f526dbffa0a1af2b28f51982445f7d9064b3c3b3e6dd04322003db22da2acde5d493c80204b36a9219d42959543c5a0aee47f2365eb713490ff2fc5f475f SHA512 663b1652bb27338310d1475a8b0422f04e68fca74be11a4b7120de948af4fc0c2b08b75ce5372d657aa89504a27b36b937b5091cb2d932297a7490d5e390d99f
 DIST curl-8.15.0.tar.xz 2773156 BLAKE2B ae809be87f34d079413129c27e618a6d15c2bf9087fd7e679cefe9b6d8645f0dd092e8c3e1f62b7bd0dffdd0b77e0bc5ac031ffce4e50060ec20b280618c8e68 SHA512 d27e316d70973906ac4b8d2c280f7e99b7528966aa1220c13a38ed45fca2ed6bbde54b8a9d7bed9e283171b92edb621f7b95162ef7d392e6383b0ee469de3191
 DIST curl-8.15.0.tar.xz.asc 488 BLAKE2B 4b0bab065a1d2d5b7e5d49989bd4953344d844cafd3036b4cb2ed2dec82e59031832f05c06dc6a801e4668d92c936df74aeff7a5f2c15ff614da4b1673a67501 SHA512 b6aef1c6a1f32c60401494df565a748fa96c1d5098138772c22f6208bafeb8e61402f3077cbc274ea2c05f35ff376d8f736c58554520f8d20fded36d876499a5
+DIST curl-8.16.0-rc2.tar.xz 2782952 BLAKE2B 2d8d28532cb424d63b6a3d9c69d35d19ab3f534f440ffebdb39458b4e2d771ac0804b83d482512a9325202b9447498d6003de6377a304213c2f35e4a17a5c365 SHA512 7cc4f56a05634c651cf7224d3844359498d127f259e531aadefe86f6df3a7fc5f6644c296407d38867ddb716fe3e4951d377592f6d977c196ad1a733374e608f
+DIST curl-8.16.0-rc2.tar.xz.asc 488 BLAKE2B 9d3488e369b8e437359e25785cfb3addbb1cfb81ef74dd8c16f3466ca643efc4f3ccc7864de20fb70c65024406882770d221c5f7ee90da16f07fe13825a71549 SHA512 c180343f1037cf51eb32c61035a4da7e728c2ee7f8d4ca1d464545b9b4044b30963e6b1ce424951a151ff901d7c7f4d56e7a54dacc581fc2c5c3b54349c155eb
+DIST curl-8.16.0-rc3.tar.xz 2785600 BLAKE2B 393381819337fca038ccc12a4fae3290a28a56322b803f7a72ef541b39235b03a7916d52df94c64c725c4b1e98928f0d1874fad999d7984dbce19bfc0055bc47 SHA512 119e00ac9c150ac1d61ce5eeb522168b8a1c68d6576077400222170e0bd9b25dbe53182166a194058e58831a8768c1b7d9145fd5051c4e13bcd12841eb3a7284
+DIST curl-8.16.0-rc3.tar.xz.asc 488 BLAKE2B 8057c9dc6171799fbbb4399291415fd452c0efbf09ea8594eeb572be9f097fd4f0d9db4389b1438daad5a4765c7b8ee59d6ae2bc90d23f46aaf92180b3418029 SHA512 50e484772ac1e8390222ce21702c6995c96b4da99d1e0f2e233b7226b48b5ce3a290d6050963e1e2c519b9a29d2ded7134d3bd4e765a946a8abbae3c67e31d32
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.12.1.ebuild b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.12.1.ebuild
index 8d74677535..0fd4d01a66 100644
--- a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.12.1.ebuild
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.12.1.ebuild
@@ -21,7 +21,7 @@ else
 		https://curl.se/download/${P}.tar.xz
 		verify-sig? ( https://curl.se/download/${P}.tar.xz.asc )
 	"
-	KEYWORDS="~alpha amd64 arm arm64 hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+	KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 fi
 
 LICENSE="BSD curl ISC test? ( BSD-4 )"
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.13.0-r1.ebuild b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.13.0-r1.ebuild
index 3307c32c94..d5551349f3 100644
--- a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.13.0-r1.ebuild
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.13.0-r1.ebuild
@@ -22,7 +22,7 @@ else
 		S="${WORKDIR}/${P//_/-}"
 	else
 		CURL_URI="https://curl.se/download/"
-		KEYWORDS="~alpha amd64 arm arm64 hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+		KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 	fi
 	SRC_URI="
 		${CURL_URI}${P//_/-}.tar.xz
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.14.1.ebuild b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.14.1.ebuild
index 71e07d9d6e..66516178ed 100644
--- a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.14.1.ebuild
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.14.1.ebuild
@@ -22,7 +22,7 @@ else
 		S="${WORKDIR}/${P//_/-}"
 	else
 		CURL_URI="https://curl.se/download/"
-		KEYWORDS="~alpha amd64 arm arm64 hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+		KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 	fi
 	SRC_URI="
 		${CURL_URI}${P//_/-}.tar.xz
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.15.0.ebuild b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.15.0.ebuild
index d4e452358f..025bd08593 100644
--- a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.15.0.ebuild
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.15.0.ebuild
@@ -22,7 +22,7 @@ else
 		S="${WORKDIR}/${P//_/-}"
 	else
 		CURL_URI="https://curl.se/download/"
-		KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ~ppc ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+		KEYWORDS="~alpha amd64 arm arm64 ~hppa ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 ~sparc x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
 	fi
 	SRC_URI="
 		${CURL_URI}${P//_/-}.tar.xz
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.16.0_rc2.ebuild b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.16.0_rc2.ebuild
new file mode 100644
index 0000000000..f9ed048bec
--- /dev/null
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.16.0_rc2.ebuild
@@ -0,0 +1,439 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# Maintainers should subscribe to the 'curl-distros' ML for backports etc
+# https://daniel.haxx.se/blog/2024/03/25/curl-distro-report/
+# https://lists.haxx.se/listinfo/curl-distros
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/danielstenberg.asc
+inherit autotools multilib-minimal multiprocessing prefix toolchain-funcs verify-sig
+
+DESCRIPTION="A Client that groks URLs"
+HOMEPAGE="https://curl.se/"
+
+if [[ ${PV} == 9999 ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/curl/curl.git"
+else
+	if [[ ${P} == *rc* ]]; then
+		CURL_URI="https://curl.se/rc/"
+		S="${WORKDIR}/${P//_/-}"
+	else
+		CURL_URI="https://curl.se/download/"
+		KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+	fi
+	SRC_URI="
+		${CURL_URI}${P//_/-}.tar.xz
+		verify-sig? ( ${CURL_URI}${P//_/-}.tar.xz.asc )
+	"
+fi
+
+LICENSE="BSD curl ISC test? ( BSD-4 )"
+SLOT="0"
+IUSE="+adns +alt-svc brotli debug ech +ftp gnutls gopher +hsts +http2 +http3 +httpsrr idn +imap kerberos ldap"
+IUSE+=" mbedtls +openssl +pop3 +psl +quic rtmp rustls samba sasl-scram +smtp ssh ssl static-libs test"
+IUSE+=" telnet +tftp +websockets zstd"
+# These select the default tls implementation / which quic impl to use
+IUSE+=" +curl_quic_openssl curl_quic_ngtcp2 curl_ssl_gnutls curl_ssl_mbedtls +curl_ssl_openssl curl_ssl_rustls"
+RESTRICT="!test? ( test )"
+
+# HTTPS RR is technically usable with the threaded resolver, but it still uses c-ares to
+# ask for the HTTPS RR record type; if DoH is in use the HTTPS record will be requested
+# in addition to A and AAAA records.
+
+# To simplify dependency management in the ebuild we'll require c-ares for HTTPS RR (for now?).
+# HTTPS RR in cURL is a dependency for:
+# - ECH (requires patched openssl or gnutls currently, enabled with rustls)
+# - Fetching the ALPN list which should provide a better HTTP/3 experience.
+
+# Only one default ssl / quic provider can be enabled
+# The default provider needs its USE satisfied
+# HTTP/3 and MultiSSL are mutually exclusive; it's not clear if MultiSSL offers any benefit at all in the modern day.
+# https://github.com/curl/curl/commit/65ece771f4602107d9cdd339dff4b420280a2c2e
+REQUIRED_USE="
+	ech? ( rustls )
+	httpsrr? ( adns )
+	quic? (
+		^^ (
+			curl_quic_openssl
+			curl_quic_ngtcp2
+		)
+		http3
+		ssl
+	)
+	ssl? (
+		^^ (
+			curl_ssl_gnutls
+			curl_ssl_mbedtls
+			curl_ssl_openssl
+			curl_ssl_rustls
+		)
+	)
+	curl_quic_openssl? (
+		curl_ssl_openssl
+		!gnutls
+		!mbedtls
+		!rustls
+	)
+	curl_quic_ngtcp2? (
+		curl_ssl_gnutls
+		!mbedtls
+		!openssl
+		!rustls
+	)
+	curl_ssl_gnutls? ( gnutls )
+	curl_ssl_mbedtls? ( mbedtls )
+	curl_ssl_openssl? ( openssl )
+	curl_ssl_rustls? ( rustls )
+	http3? ( alt-svc httpsrr quic )
+"
+
+# cURL's docs and CI/CD are great resources for confirming supported versions
+# particulary for fast-moving targets like HTTP/2 and TCP/2 e.g.:
+# - https://github.com/curl/curl/blob/master/docs/INTERNALS.md (core dependencies + minimum versions)
+# - https://github.com/curl/curl/blob/master/docs/HTTP3.md (example of a feature that moves quickly)
+# - https://github.com/curl/curl/blob/master/.github/workflows/http3-linux.yml (CI/CD for TCP/2)
+# However 'supported' vs 'works' are two entirely different things; be sane but
+# don't be afraid to require a later version.
+# ngtcp2 = https://bugs.gentoo.org/912029 - can only build with one tls backend at a time.
+RDEPEND="
+	>=sys-libs/zlib-1.2.5[${MULTILIB_USEDEP}]
+	adns? ( >=net-dns/c-ares-1.16.0:=[${MULTILIB_USEDEP}] )
+	brotli? ( app-arch/brotli:=[${MULTILIB_USEDEP}] )
+	http2? ( >=net-libs/nghttp2-1.15.0:=[${MULTILIB_USEDEP}] )
+	http3? ( >=net-libs/nghttp3-1.1.0[${MULTILIB_USEDEP}] )
+	idn? ( >=net-dns/libidn2-2.0.0:=[static-libs?,${MULTILIB_USEDEP}] )
+	kerberos? ( >=virtual/krb5-0-r1[${MULTILIB_USEDEP}] )
+	ldap? ( >=net-nds/openldap-2.0.0:=[static-libs?,${MULTILIB_USEDEP}] )
+	psl? ( net-libs/libpsl[${MULTILIB_USEDEP}] )
+	quic? (
+		curl_quic_openssl? ( >=dev-libs/openssl-3.3.0:=[quic,${MULTILIB_USEDEP}] )
+		curl_quic_ngtcp2? ( >=net-libs/ngtcp2-1.2.0[gnutls,ssl,-openssl,${MULTILIB_USEDEP}] )
+	)
+	rtmp? ( media-video/rtmpdump[${MULTILIB_USEDEP}] )
+	ssh? ( >=net-libs/libssh2-1.2.8[${MULTILIB_USEDEP}] )
+	sasl-scram? ( >=net-misc/gsasl-2.2.0[static-libs?,${MULTILIB_USEDEP}] )
+	ssl? (
+		gnutls? (
+			app-misc/ca-certificates
+			>=net-libs/gnutls-3.1.10:=[static-libs?,${MULTILIB_USEDEP}]
+			dev-libs/nettle:=[${MULTILIB_USEDEP}]
+		)
+		mbedtls? (
+			app-misc/ca-certificates
+			net-libs/mbedtls:0=[${MULTILIB_USEDEP}]
+		)
+		openssl? (
+			>=dev-libs/openssl-1.0.2:=[static-libs?,${MULTILIB_USEDEP}]
+		)
+		rustls? (
+			>=net-libs/rustls-ffi-0.15.0:=[${MULTILIB_USEDEP}]
+		)
+	)
+	zstd? ( app-arch/zstd:=[${MULTILIB_USEDEP}] )
+"
+
+DEPEND="${RDEPEND}"
+
+BDEPEND="
+	dev-lang/perl
+	virtual/pkgconfig
+	test? (
+		sys-apps/diffutils
+		http2? ( >=net-libs/nghttp2-1.15.0:=[utils,${MULTILIB_USEDEP}] )
+		http3? ( net-libs/nghttp2:=[utils,${MULTILIB_USEDEP}] )
+	)
+	verify-sig? ( sec-keys/openpgp-keys-danielstenberg )
+"
+
+DOCS=( README docs/{FEATURES.md,INTERNALS.md,FAQ,BUGS.md,CONTRIBUTE.md} )
+
+MULTILIB_WRAPPED_HEADERS=(
+	/usr/include/curl/curlbuild.h
+)
+
+MULTILIB_CHOST_TOOLS=(
+	/usr/bin/curl-config
+)
+
+QA_CONFIG_IMPL_DECL_SKIP=(
+	__builtin_available
+	closesocket
+	CloseSocket
+	getpass_r
+	ioctlsocket
+	IoctlSocket
+	mach_absolute_time
+	setmode
+	_fseeki64
+	# custom AC_LINK_IFELSE code fails to link even without -Werror
+	OSSL_QUIC_client_method
+)
+
+PATCHES=(
+	"${FILESDIR}/${PN}-prefix-5.patch"
+	"${FILESDIR}/${PN}-respect-cflags-3.patch"
+)
+
+src_prepare() {
+	default
+
+	eprefixify curl-config.in
+	eautoreconf
+}
+
+# Generates TLS-related configure options based on USE flags.
+# Outputs options suitable for appending to a configure options array.
+_get_curl_tls_configure_opts() {
+	local tls_opts=()
+
+	local backend flag_name
+	for backend in gnutls mbedtls openssl rustls; do
+		if [[ "$backend" == "openssl" ]]; then
+			flag_name="ssl"
+			tls_opts+=( "--with-ca-path=${EPREFIX}/etc/ssl/certs")
+		else
+			flag_name="$backend"
+		fi
+
+		if use "$backend"; then
+			tls_opts+=( "--with-${flag_name}" )
+		else
+			# If a single backend is enabled, 'ssl' is required, openssl is the default / fallback
+			if ! [[ "$backend" == "openssl" ]]; then
+				tls_opts+=( "--without-${flag_name}" )
+			fi
+		fi
+	done
+
+	if use curl_ssl_gnutls; then
+		multilib_is_native_abi && einfo "Default TLS backend: gnutls"
+		tls_opts+=( "--with-default-ssl-backend=gnutls" )
+	elif use curl_ssl_mbedtls; then
+		multilib_is_native_abi && einfo "Default TLS backend: mbedtls"
+		tls_opts+=( "--with-default-ssl-backend=mbedtls" )
+	elif use curl_ssl_openssl; then
+		multilib_is_native_abi && einfo "Default TLS backend: openssl"
+		tls_opts+=( "--with-default-ssl-backend=openssl" )
+	elif use curl_ssl_rustls; then
+		multilib_is_native_abi && einfo "Default TLS backend: rustls"
+		tls_opts+=( "--with-default-ssl-backend=rustls" )
+	else
+		eerror "We can't be here because of REQUIRED_USE."
+		die "Please file a bug, hit impossible condition w/ USE=ssl handling."
+	fi
+
+	# Explicitly Disable unimplemented backends
+	tls_opts+=(
+		--without-amissl
+		--without-wolfssl
+	)
+
+	printf "%s\n" "${tls_opts[@]}"
+}
+
+multilib_src_configure() {
+	# We make use of the fact that later flags override earlier ones
+	# So start with all ssl providers off until proven otherwise
+	# TODO: in the future, we may want to add wolfssl (https://www.wolfssl.com/)
+	local myconf=()
+
+	myconf+=( --without-ca-fallback --with-ca-bundle="${EPREFIX}"/etc/ssl/certs/ca-certificates.crt  )
+	if use ssl; then
+		local -a tls_backend_opts
+		readarray -t tls_backend_opts < <(_get_curl_tls_configure_opts)
+		myconf+=("${tls_backend_opts[@]}")
+		if use quic; then
+			myconf+=(
+				$(use_with curl_quic_ngtcp2 ngtcp2)
+				$(use_with curl_quic_openssl openssl-quic)
+			)
+		else
+			# Without a REQUIRED_USE to ensure that QUIC was requested when at least one default backend is
+			# enabled we need ensure that we don't try to build QUIC support
+			myconf+=( --without-ngtcp2 --without-openssl-quic )
+		fi
+	else
+		myconf+=( --without-ssl )
+		einfo "SSL disabled"
+	fi
+
+	# These configuration options are organised alphabetically by category/type
+
+	# Protocols
+	# `grep SUPPORT_PROTOCOLS=\" configure.ac | awk '{ print substr($2, 1, length($2)-1)}' | sort`
+	# Assume that anything omitted (that is not new!) is enabled by default with no deps
+	myconf+=(
+		--enable-file
+		$(use_enable ftp)
+		$(use_enable gopher)
+		--enable-http
+		$(use_enable imap) # Automatic IMAPS if TLS is enabled
+		$(use_enable ldap ldaps)
+		$(use_enable ldap)
+		$(use_enable pop3)
+		$(use_enable samba smb)
+		$(use_with ssh libssh2) # enables scp/sftp
+		$(use_with rtmp librtmp)
+		--enable-rtsp
+		$(use_enable smtp)
+		$(use_enable telnet)
+		$(use_enable tftp)
+		$(use_enable websockets)
+	)
+
+	# Keep various 'HTTP-flavoured' options together
+	myconf+=(
+		$(use_enable alt-svc)
+		$(use_enable hsts)
+		$(use_enable httpsrr)
+		$(use_with http2 nghttp2)
+		$(use_with http3 nghttp3)
+	)
+
+	# --enable/disable options
+	# `grep -- --enable configure | grep Check | awk '{ print $4 }' | sort`
+	myconf+=(
+		$(use_enable adns ares)
+		--enable-aws
+		--enable-basic-auth
+		--enable-bearer-auth
+		--enable-cookies
+		--enable-dateparse
+		--enable-dict
+		--enable-digest-auth
+		--enable-dnsshuffle
+		--enable-doh
+		$(use_enable ech)
+		--enable-http-auth
+		--enable-ipv6
+		--enable-kerberos-auth
+		--enable-largefile
+		--enable-manual
+		--enable-mime
+		--enable-negotiate-auth
+		--enable-netrc
+		--enable-ntlm
+		--enable-progress-meter
+		--enable-proxy
+		--enable-rt
+		--enable-socketpair
+		--disable-sspi
+		$(use_enable static-libs static)
+		--enable-symbol-hiding
+		--enable-tls-srp
+		--disable-versioned-symbols
+	)
+
+	# --with/without options
+	# `grep -- --with configure | grep Check | awk '{ print $4 }' | sort`
+	myconf+=(
+		$(use_with brotli)
+		--with-fish-functions-dir="${EPREFIX}"/usr/share/fish/vendor_completions.d
+		$(use_with idn libidn2)
+		$(use_with kerberos gssapi "${EPREFIX}"/usr)
+		$(use_with sasl-scram libgsasl)
+		$(use_with psl libpsl)
+		--without-quiche
+		--without-schannel
+		--without-winidn
+		--with-zlib
+		--with-zsh-functions-dir="${EPREFIX}"/usr/share/zsh/site-functions
+		$(use_with zstd)
+	)
+
+	# Test deps (disabled)
+	myconf+=(
+		--without-test-caddy
+		--without-test-httpd
+		--without-test-nghttpx
+	)
+
+	if use debug; then
+		myconf+=(
+			--enable-debug
+		)
+	fi
+
+	if use test && multilib_is_native_abi && ( use http2 || use http3 ); then
+		myconf+=(
+			--with-test-nghttpx="${BROOT}/usr/bin/nghttpx"
+		)
+	fi
+
+	# Since 8.12.0 adns/c-ares and the threaded resolver are mutually exclusive
+	# This is in support of some work to enable `httpsrr` to use adns and the rest
+	# of curl to use the threaded resolver; for us `httpsrr` is conditional on adns.
+	if use adns; then
+		myconf+=(
+			--disable-threaded-resolver
+		)
+	else
+		myconf+=(
+			--enable-threaded-resolver
+		)
+	fi
+
+	ECONF_SOURCE="${S}" econf "${myconf[@]}"
+
+	if ! multilib_is_native_abi; then
+		# Avoid building the client (we just want libcurl for multilib)
+		sed -i -e '/SUBDIRS/s:src::' Makefile || die
+		sed -i -e '/SUBDIRS/s:scripts::' Makefile || die
+	fi
+
+}
+
+multilib_src_compile() {
+	default
+
+	if multilib_is_native_abi; then
+		# Shell completions
+		! tc-is-cross-compiler && emake -C scripts
+	fi
+}
+
+# There is also a pytest harness that tests for bugs in some very specific
+# situations; we can rely on upstream for this rather than adding additional test deps.
+multilib_src_test() {
+	# See https://github.com/curl/curl/blob/master/tests/runtests.pl#L5721
+	# -n: no valgrind (unreliable in sandbox and doesn't work correctly on all arches)
+	# -v: verbose
+	# -a: keep going on failure (so we see everything that breaks, not just 1st test)
+	# -k: keep test files after completion
+	# -am: automake style TAP output
+	# -p: print logs if test fails
+	# Note: if needed, we can skip specific tests. See e.g. Fedora's packaging
+	# or just read https://github.com/curl/curl/tree/master/tests#run.
+	# Note: we don't run the testsuite for cross-compilation.
+	# Upstream recommend 7*nproc as a starting point for parallel tests, but
+	# this ends up breaking when nproc is huge (like -j80).
+	# The network sandbox causes tests 241 and 1083 to fail; these are typically skipped
+	# as most gentoo users don't have an 'ip6-localhost'
+	multilib_is_native_abi && emake test TFLAGS="-n -v -a -k -am -p -j$((2*$(makeopts_jobs))) !241 !1083"
+}
+
+multilib_src_install() {
+	emake DESTDIR="${D}" install
+
+	if multilib_is_native_abi; then
+		# Shell completions
+		! tc-is-cross-compiler && emake -C scripts DESTDIR="${D}" install
+	fi
+}
+
+multilib_src_install_all() {
+	einstalldocs
+	find "${ED}" -type f -name '*.la' -delete || die
+	rm -rf "${ED}"/etc/ || die
+}
+
+pkg_postinst() {
+	if use debug; then
+		ewarn "USE=debug has been selected, enabling debug codepaths and making cURL extra verbose."
+		ewarn "Use this _only_ for testing. Debug builds should _not_ be used in anger."
+		ewarn "hic sunt dracones; you have been warned."
+	fi
+}
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.16.0_rc3.ebuild b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.16.0_rc3.ebuild
new file mode 100644
index 0000000000..f9ed048bec
--- /dev/null
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-8.16.0_rc3.ebuild
@@ -0,0 +1,439 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+# Maintainers should subscribe to the 'curl-distros' ML for backports etc
+# https://daniel.haxx.se/blog/2024/03/25/curl-distro-report/
+# https://lists.haxx.se/listinfo/curl-distros
+
+VERIFY_SIG_OPENPGP_KEY_PATH=/usr/share/openpgp-keys/danielstenberg.asc
+inherit autotools multilib-minimal multiprocessing prefix toolchain-funcs verify-sig
+
+DESCRIPTION="A Client that groks URLs"
+HOMEPAGE="https://curl.se/"
+
+if [[ ${PV} == 9999 ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/curl/curl.git"
+else
+	if [[ ${P} == *rc* ]]; then
+		CURL_URI="https://curl.se/rc/"
+		S="${WORKDIR}/${P//_/-}"
+	else
+		CURL_URI="https://curl.se/download/"
+		KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~arm64-macos ~ppc-macos ~x64-macos ~x64-solaris"
+	fi
+	SRC_URI="
+		${CURL_URI}${P//_/-}.tar.xz
+		verify-sig? ( ${CURL_URI}${P//_/-}.tar.xz.asc )
+	"
+fi
+
+LICENSE="BSD curl ISC test? ( BSD-4 )"
+SLOT="0"
+IUSE="+adns +alt-svc brotli debug ech +ftp gnutls gopher +hsts +http2 +http3 +httpsrr idn +imap kerberos ldap"
+IUSE+=" mbedtls +openssl +pop3 +psl +quic rtmp rustls samba sasl-scram +smtp ssh ssl static-libs test"
+IUSE+=" telnet +tftp +websockets zstd"
+# These select the default tls implementation / which quic impl to use
+IUSE+=" +curl_quic_openssl curl_quic_ngtcp2 curl_ssl_gnutls curl_ssl_mbedtls +curl_ssl_openssl curl_ssl_rustls"
+RESTRICT="!test? ( test )"
+
+# HTTPS RR is technically usable with the threaded resolver, but it still uses c-ares to
+# ask for the HTTPS RR record type; if DoH is in use the HTTPS record will be requested
+# in addition to A and AAAA records.
+
+# To simplify dependency management in the ebuild we'll require c-ares for HTTPS RR (for now?).
+# HTTPS RR in cURL is a dependency for:
+# - ECH (requires patched openssl or gnutls currently, enabled with rustls)
+# - Fetching the ALPN list which should provide a better HTTP/3 experience.
+
+# Only one default ssl / quic provider can be enabled
+# The default provider needs its USE satisfied
+# HTTP/3 and MultiSSL are mutually exclusive; it's not clear if MultiSSL offers any benefit at all in the modern day.
+# https://github.com/curl/curl/commit/65ece771f4602107d9cdd339dff4b420280a2c2e
+REQUIRED_USE="
+	ech? ( rustls )
+	httpsrr? ( adns )
+	quic? (
+		^^ (
+			curl_quic_openssl
+			curl_quic_ngtcp2
+		)
+		http3
+		ssl
+	)
+	ssl? (
+		^^ (
+			curl_ssl_gnutls
+			curl_ssl_mbedtls
+			curl_ssl_openssl
+			curl_ssl_rustls
+		)
+	)
+	curl_quic_openssl? (
+		curl_ssl_openssl
+		!gnutls
+		!mbedtls
+		!rustls
+	)
+	curl_quic_ngtcp2? (
+		curl_ssl_gnutls
+		!mbedtls
+		!openssl
+		!rustls
+	)
+	curl_ssl_gnutls? ( gnutls )
+	curl_ssl_mbedtls? ( mbedtls )
+	curl_ssl_openssl? ( openssl )
+	curl_ssl_rustls? ( rustls )
+	http3? ( alt-svc httpsrr quic )
+"
+
+# cURL's docs and CI/CD are great resources for confirming supported versions
+# particulary for fast-moving targets like HTTP/2 and TCP/2 e.g.:
+# - https://github.com/curl/curl/blob/master/docs/INTERNALS.md (core dependencies + minimum versions)
+# - https://github.com/curl/curl/blob/master/docs/HTTP3.md (example of a feature that moves quickly)
+# - https://github.com/curl/curl/blob/master/.github/workflows/http3-linux.yml (CI/CD for TCP/2)
+# However 'supported' vs 'works' are two entirely different things; be sane but
+# don't be afraid to require a later version.
+# ngtcp2 = https://bugs.gentoo.org/912029 - can only build with one tls backend at a time.
+RDEPEND="
+	>=sys-libs/zlib-1.2.5[${MULTILIB_USEDEP}]
+	adns? ( >=net-dns/c-ares-1.16.0:=[${MULTILIB_USEDEP}] )
+	brotli? ( app-arch/brotli:=[${MULTILIB_USEDEP}] )
+	http2? ( >=net-libs/nghttp2-1.15.0:=[${MULTILIB_USEDEP}] )
+	http3? ( >=net-libs/nghttp3-1.1.0[${MULTILIB_USEDEP}] )
+	idn? ( >=net-dns/libidn2-2.0.0:=[static-libs?,${MULTILIB_USEDEP}] )
+	kerberos? ( >=virtual/krb5-0-r1[${MULTILIB_USEDEP}] )
+	ldap? ( >=net-nds/openldap-2.0.0:=[static-libs?,${MULTILIB_USEDEP}] )
+	psl? ( net-libs/libpsl[${MULTILIB_USEDEP}] )
+	quic? (
+		curl_quic_openssl? ( >=dev-libs/openssl-3.3.0:=[quic,${MULTILIB_USEDEP}] )
+		curl_quic_ngtcp2? ( >=net-libs/ngtcp2-1.2.0[gnutls,ssl,-openssl,${MULTILIB_USEDEP}] )
+	)
+	rtmp? ( media-video/rtmpdump[${MULTILIB_USEDEP}] )
+	ssh? ( >=net-libs/libssh2-1.2.8[${MULTILIB_USEDEP}] )
+	sasl-scram? ( >=net-misc/gsasl-2.2.0[static-libs?,${MULTILIB_USEDEP}] )
+	ssl? (
+		gnutls? (
+			app-misc/ca-certificates
+			>=net-libs/gnutls-3.1.10:=[static-libs?,${MULTILIB_USEDEP}]
+			dev-libs/nettle:=[${MULTILIB_USEDEP}]
+		)
+		mbedtls? (
+			app-misc/ca-certificates
+			net-libs/mbedtls:0=[${MULTILIB_USEDEP}]
+		)
+		openssl? (
+			>=dev-libs/openssl-1.0.2:=[static-libs?,${MULTILIB_USEDEP}]
+		)
+		rustls? (
+			>=net-libs/rustls-ffi-0.15.0:=[${MULTILIB_USEDEP}]
+		)
+	)
+	zstd? ( app-arch/zstd:=[${MULTILIB_USEDEP}] )
+"
+
+DEPEND="${RDEPEND}"
+
+BDEPEND="
+	dev-lang/perl
+	virtual/pkgconfig
+	test? (
+		sys-apps/diffutils
+		http2? ( >=net-libs/nghttp2-1.15.0:=[utils,${MULTILIB_USEDEP}] )
+		http3? ( net-libs/nghttp2:=[utils,${MULTILIB_USEDEP}] )
+	)
+	verify-sig? ( sec-keys/openpgp-keys-danielstenberg )
+"
+
+DOCS=( README docs/{FEATURES.md,INTERNALS.md,FAQ,BUGS.md,CONTRIBUTE.md} )
+
+MULTILIB_WRAPPED_HEADERS=(
+	/usr/include/curl/curlbuild.h
+)
+
+MULTILIB_CHOST_TOOLS=(
+	/usr/bin/curl-config
+)
+
+QA_CONFIG_IMPL_DECL_SKIP=(
+	__builtin_available
+	closesocket
+	CloseSocket
+	getpass_r
+	ioctlsocket
+	IoctlSocket
+	mach_absolute_time
+	setmode
+	_fseeki64
+	# custom AC_LINK_IFELSE code fails to link even without -Werror
+	OSSL_QUIC_client_method
+)
+
+PATCHES=(
+	"${FILESDIR}/${PN}-prefix-5.patch"
+	"${FILESDIR}/${PN}-respect-cflags-3.patch"
+)
+
+src_prepare() {
+	default
+
+	eprefixify curl-config.in
+	eautoreconf
+}
+
+# Generates TLS-related configure options based on USE flags.
+# Outputs options suitable for appending to a configure options array.
+_get_curl_tls_configure_opts() {
+	local tls_opts=()
+
+	local backend flag_name
+	for backend in gnutls mbedtls openssl rustls; do
+		if [[ "$backend" == "openssl" ]]; then
+			flag_name="ssl"
+			tls_opts+=( "--with-ca-path=${EPREFIX}/etc/ssl/certs")
+		else
+			flag_name="$backend"
+		fi
+
+		if use "$backend"; then
+			tls_opts+=( "--with-${flag_name}" )
+		else
+			# If a single backend is enabled, 'ssl' is required, openssl is the default / fallback
+			if ! [[ "$backend" == "openssl" ]]; then
+				tls_opts+=( "--without-${flag_name}" )
+			fi
+		fi
+	done
+
+	if use curl_ssl_gnutls; then
+		multilib_is_native_abi && einfo "Default TLS backend: gnutls"
+		tls_opts+=( "--with-default-ssl-backend=gnutls" )
+	elif use curl_ssl_mbedtls; then
+		multilib_is_native_abi && einfo "Default TLS backend: mbedtls"
+		tls_opts+=( "--with-default-ssl-backend=mbedtls" )
+	elif use curl_ssl_openssl; then
+		multilib_is_native_abi && einfo "Default TLS backend: openssl"
+		tls_opts+=( "--with-default-ssl-backend=openssl" )
+	elif use curl_ssl_rustls; then
+		multilib_is_native_abi && einfo "Default TLS backend: rustls"
+		tls_opts+=( "--with-default-ssl-backend=rustls" )
+	else
+		eerror "We can't be here because of REQUIRED_USE."
+		die "Please file a bug, hit impossible condition w/ USE=ssl handling."
+	fi
+
+	# Explicitly Disable unimplemented backends
+	tls_opts+=(
+		--without-amissl
+		--without-wolfssl
+	)
+
+	printf "%s\n" "${tls_opts[@]}"
+}
+
+multilib_src_configure() {
+	# We make use of the fact that later flags override earlier ones
+	# So start with all ssl providers off until proven otherwise
+	# TODO: in the future, we may want to add wolfssl (https://www.wolfssl.com/)
+	local myconf=()
+
+	myconf+=( --without-ca-fallback --with-ca-bundle="${EPREFIX}"/etc/ssl/certs/ca-certificates.crt  )
+	if use ssl; then
+		local -a tls_backend_opts
+		readarray -t tls_backend_opts < <(_get_curl_tls_configure_opts)
+		myconf+=("${tls_backend_opts[@]}")
+		if use quic; then
+			myconf+=(
+				$(use_with curl_quic_ngtcp2 ngtcp2)
+				$(use_with curl_quic_openssl openssl-quic)
+			)
+		else
+			# Without a REQUIRED_USE to ensure that QUIC was requested when at least one default backend is
+			# enabled we need ensure that we don't try to build QUIC support
+			myconf+=( --without-ngtcp2 --without-openssl-quic )
+		fi
+	else
+		myconf+=( --without-ssl )
+		einfo "SSL disabled"
+	fi
+
+	# These configuration options are organised alphabetically by category/type
+
+	# Protocols
+	# `grep SUPPORT_PROTOCOLS=\" configure.ac | awk '{ print substr($2, 1, length($2)-1)}' | sort`
+	# Assume that anything omitted (that is not new!) is enabled by default with no deps
+	myconf+=(
+		--enable-file
+		$(use_enable ftp)
+		$(use_enable gopher)
+		--enable-http
+		$(use_enable imap) # Automatic IMAPS if TLS is enabled
+		$(use_enable ldap ldaps)
+		$(use_enable ldap)
+		$(use_enable pop3)
+		$(use_enable samba smb)
+		$(use_with ssh libssh2) # enables scp/sftp
+		$(use_with rtmp librtmp)
+		--enable-rtsp
+		$(use_enable smtp)
+		$(use_enable telnet)
+		$(use_enable tftp)
+		$(use_enable websockets)
+	)
+
+	# Keep various 'HTTP-flavoured' options together
+	myconf+=(
+		$(use_enable alt-svc)
+		$(use_enable hsts)
+		$(use_enable httpsrr)
+		$(use_with http2 nghttp2)
+		$(use_with http3 nghttp3)
+	)
+
+	# --enable/disable options
+	# `grep -- --enable configure | grep Check | awk '{ print $4 }' | sort`
+	myconf+=(
+		$(use_enable adns ares)
+		--enable-aws
+		--enable-basic-auth
+		--enable-bearer-auth
+		--enable-cookies
+		--enable-dateparse
+		--enable-dict
+		--enable-digest-auth
+		--enable-dnsshuffle
+		--enable-doh
+		$(use_enable ech)
+		--enable-http-auth
+		--enable-ipv6
+		--enable-kerberos-auth
+		--enable-largefile
+		--enable-manual
+		--enable-mime
+		--enable-negotiate-auth
+		--enable-netrc
+		--enable-ntlm
+		--enable-progress-meter
+		--enable-proxy
+		--enable-rt
+		--enable-socketpair
+		--disable-sspi
+		$(use_enable static-libs static)
+		--enable-symbol-hiding
+		--enable-tls-srp
+		--disable-versioned-symbols
+	)
+
+	# --with/without options
+	# `grep -- --with configure | grep Check | awk '{ print $4 }' | sort`
+	myconf+=(
+		$(use_with brotli)
+		--with-fish-functions-dir="${EPREFIX}"/usr/share/fish/vendor_completions.d
+		$(use_with idn libidn2)
+		$(use_with kerberos gssapi "${EPREFIX}"/usr)
+		$(use_with sasl-scram libgsasl)
+		$(use_with psl libpsl)
+		--without-quiche
+		--without-schannel
+		--without-winidn
+		--with-zlib
+		--with-zsh-functions-dir="${EPREFIX}"/usr/share/zsh/site-functions
+		$(use_with zstd)
+	)
+
+	# Test deps (disabled)
+	myconf+=(
+		--without-test-caddy
+		--without-test-httpd
+		--without-test-nghttpx
+	)
+
+	if use debug; then
+		myconf+=(
+			--enable-debug
+		)
+	fi
+
+	if use test && multilib_is_native_abi && ( use http2 || use http3 ); then
+		myconf+=(
+			--with-test-nghttpx="${BROOT}/usr/bin/nghttpx"
+		)
+	fi
+
+	# Since 8.12.0 adns/c-ares and the threaded resolver are mutually exclusive
+	# This is in support of some work to enable `httpsrr` to use adns and the rest
+	# of curl to use the threaded resolver; for us `httpsrr` is conditional on adns.
+	if use adns; then
+		myconf+=(
+			--disable-threaded-resolver
+		)
+	else
+		myconf+=(
+			--enable-threaded-resolver
+		)
+	fi
+
+	ECONF_SOURCE="${S}" econf "${myconf[@]}"
+
+	if ! multilib_is_native_abi; then
+		# Avoid building the client (we just want libcurl for multilib)
+		sed -i -e '/SUBDIRS/s:src::' Makefile || die
+		sed -i -e '/SUBDIRS/s:scripts::' Makefile || die
+	fi
+
+}
+
+multilib_src_compile() {
+	default
+
+	if multilib_is_native_abi; then
+		# Shell completions
+		! tc-is-cross-compiler && emake -C scripts
+	fi
+}
+
+# There is also a pytest harness that tests for bugs in some very specific
+# situations; we can rely on upstream for this rather than adding additional test deps.
+multilib_src_test() {
+	# See https://github.com/curl/curl/blob/master/tests/runtests.pl#L5721
+	# -n: no valgrind (unreliable in sandbox and doesn't work correctly on all arches)
+	# -v: verbose
+	# -a: keep going on failure (so we see everything that breaks, not just 1st test)
+	# -k: keep test files after completion
+	# -am: automake style TAP output
+	# -p: print logs if test fails
+	# Note: if needed, we can skip specific tests. See e.g. Fedora's packaging
+	# or just read https://github.com/curl/curl/tree/master/tests#run.
+	# Note: we don't run the testsuite for cross-compilation.
+	# Upstream recommend 7*nproc as a starting point for parallel tests, but
+	# this ends up breaking when nproc is huge (like -j80).
+	# The network sandbox causes tests 241 and 1083 to fail; these are typically skipped
+	# as most gentoo users don't have an 'ip6-localhost'
+	multilib_is_native_abi && emake test TFLAGS="-n -v -a -k -am -p -j$((2*$(makeopts_jobs))) !241 !1083"
+}
+
+multilib_src_install() {
+	emake DESTDIR="${D}" install
+
+	if multilib_is_native_abi; then
+		# Shell completions
+		! tc-is-cross-compiler && emake -C scripts DESTDIR="${D}" install
+	fi
+}
+
+multilib_src_install_all() {
+	einstalldocs
+	find "${ED}" -type f -name '*.la' -delete || die
+	rm -rf "${ED}"/etc/ || die
+}
+
+pkg_postinst() {
+	if use debug; then
+		ewarn "USE=debug has been selected, enabling debug codepaths and making cURL extra verbose."
+		ewarn "Use this _only_ for testing. Debug builds should _not_ be used in anger."
+		ewarn "hic sunt dracones; you have been warned."
+	fi
+}
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-9999.ebuild b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-9999.ebuild
index 807efaf7a1..f9ed048bec 100644
--- a/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-9999.ebuild
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/curl-9999.ebuild
@@ -173,7 +173,7 @@ QA_CONFIG_IMPL_DECL_SKIP=(
 )
 
 PATCHES=(
-	"${FILESDIR}/${PN}-prefix-4.patch"
+	"${FILESDIR}/${PN}-prefix-5.patch"
 	"${FILESDIR}/${PN}-respect-cflags-3.patch"
 )
 
@@ -336,7 +336,6 @@ multilib_src_configure() {
 		$(use_with kerberos gssapi "${EPREFIX}"/usr)
 		$(use_with sasl-scram libgsasl)
 		$(use_with psl libpsl)
-		--without-msh3
 		--without-quiche
 		--without-schannel
 		--without-winidn
diff --git a/sdk_container/src/third_party/portage-stable/net-misc/curl/files/curl-prefix-5.patch b/sdk_container/src/third_party/portage-stable/net-misc/curl/files/curl-prefix-5.patch
new file mode 100644
index 0000000000..77070171ae
--- /dev/null
+++ b/sdk_container/src/third_party/portage-stable/net-misc/curl/files/curl-prefix-5.patch
@@ -0,0 +1,29 @@
+From 05d97da1f669a1486489897128c2374b562ab176 Mon Sep 17 00:00:00 2001
+From: Matt Jolly <kangie@gentoo.org>
+Date: Tue, 2 Sep 2025 08:41:51 +1000
+Subject: [PATCH] Update prefix patch for 8.16.0
+
+Signed-off-by: Matt Jolly <kangie@gentoo.org>
+--- a/curl-config.in
++++ b/curl-config.in
+@@ -141,7 +141,7 @@ while test "$#" -gt 0; do
+     ;;
+ 
+   --cflags)
+-    if test "@includedir@" = '/usr/include'; then
++    if test "@includedir@" = "GENTOO_PORTAGE_EPREFIX@/usr/include"; then
+       echo '@LIBCURL_PC_CFLAGS@'
+     else
+       echo "@LIBCURL_PC_CFLAGS@ -I@includedir@"
+@@ -149,7 +149,7 @@ while test "$#" -gt 0; do
+     ;;
+ 
+   --libs)
+-    if test "@libdir@" != '/usr/lib' -a "@libdir@" != '/usr/lib64'; then
++    if test "@libdir@" != "@GENTOO_PORTAGE_EPREFIX@/usr/lib" -a "@libdir@" != "@GENTOO_PORTAGE_EPREFIX@/usr/lib64"; then
+       curllibdir="-L@libdir@ "
+     else
+       curllibdir=''
+-- 
+2.50.1
+