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diff --git a/dev-db/postgresql/postgresql-9999.ebuild b/dev-db/postgresql/postgresql-9999.ebuild
new file mode 100644
index 000000000000..46e9d1d3a817
--- /dev/null
+++ b/dev-db/postgresql/postgresql-9999.ebuild
@@ -0,0 +1,485 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{13..14} )
+LLVM_COMPAT=( {16..21} )
+LLVM_OPTIONAL=1
+
+inherit dot-a flag-o-matic linux-info llvm-r1 meson pam python-single-r1 \
+		systemd tmpfiles
+
+DESCRIPTION="PostgreSQL RDBMS"
+HOMEPAGE="https://www.postgresql.org/"
+LICENSE="POSTGRESQL GPL-2"
+
+SLOT=$(ver_cut 1)
+
+if [[ $PV = *9999* ]] ; then
+	inherit git-r3
+	EGIT_REPO_URI="https://git.postgresql.org/git/postgresql.git"
+else
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~x64-macos ~x64-solaris"
+
+	MY_PV=${PV/_/}
+	SRC_URI="https://ftp.postgresql.org/pub/source/v${MY_PV}/postgresql-${MY_PV}.tar.bz2"
+	S="${WORKDIR}/${PN}-${MY_PV}"
+fi
+
+IUSE="debug doc +icu kerberos ldap llvm +lz4 nls numa oauth pam perl python +readline
+	selinux systemd ssl static-libs tcl test uring uuid xml zlib zstd"
+
+REQUIRED_USE="
+llvm? ( ${LLVM_REQUIRED_USE} )
+python? ( ${PYTHON_REQUIRED_USE} )
+"
+RESTRICT="!test? ( test )"
+
+CDEPEND="
+>=app-eselect/eselect-postgresql-2.0
+acct-group/postgres
+acct-user/postgres
+sys-apps/less
+virtual/libintl
+icu? ( dev-libs/icu:= )
+kerberos? ( app-crypt/mit-krb5 )
+ldap? ( net-nds/openldap:= )
+llvm? ( $(llvm_gen_dep '
+	llvm-core/clang:${LLVM_SLOT}
+	llvm-core/llvm:${LLVM_SLOT}
+	') )
+lz4? ( app-arch/lz4 )
+numa? ( sys-process/numactl )
+oauth? ( net-misc/curl[adns] )
+pam? ( sys-libs/pam )
+perl? ( >=dev-lang/perl-5.14:= )
+python? ( ${PYTHON_DEPS} )
+readline? ( sys-libs/readline:0= )
+ssl? ( >=dev-libs/openssl-0.9.6-r1:0= )
+systemd? ( sys-apps/systemd )
+tcl? ( >=dev-lang/tcl-8:0= )
+uring? ( sys-libs/liburing )
+xml? (
+	dev-libs/libxml2:=
+	dev-libs/libxslt
+)
+zlib? ( virtual/zlib:= )
+zstd? ( app-arch/zstd )
+"
+
+# uuid flags -- depend on sys-apps/util-linux for Linux libcs, or if no
+# supported libc in use depend on dev-libs/ossp-uuid. For BSD systems,
+# the libc includes UUID functions.
+UTIL_LINUX_LIBC=( elibc_{glibc,musl} )
+
+nest_usedep() {
+	local front back
+	while [[ ${#} -gt 1 ]]; do
+		front+="${1}? ( "
+		back+=" )"
+		shift
+	done
+	echo "${front}${1}${back}"
+}
+
+CDEPEND+="
+uuid? (
+	${UTIL_LINUX_LIBC[@]/%/? ( sys-apps/util-linux )}
+	$(nest_usedep ${UTIL_LINUX_LIBC[@]/#/!} dev-libs/ossp-uuid)
+)"
+
+DEPEND="${CDEPEND}
+>=dev-lang/perl-5.8
+app-alternatives/lex
+sys-devel/bison
+nls? ( sys-devel/gettext )
+xml? ( virtual/pkgconfig )
+"
+
+RDEPEND="${CDEPEND}
+selinux? ( sec-policy/selinux-postgresql )
+"
+
+# Docbook, XML, and XSLT are needed to generate manpages and
+# any documentation that may be elected.
+BDEPEND="
+app-text/docbook-dsssl-stylesheets
+app-text/docbook-sgml-dtd:4.5
+app-text/docbook-xml-dtd:4.5
+app-text/docbook-xsl-stylesheets
+dev-libs/libxml2
+dev-libs/libxslt
+test? (
+	>=dev-lang/perl-5.14:=
+	dev-perl/IPC-Run
+	virtual/perl-Test-Simple
+	virtual/perl-ExtUtils-MakeMaker
+)
+"
+
+pkg_setup() {
+	CONFIG_CHECK="~SYSVIPC" linux-info_pkg_setup
+
+	use llvm && llvm-r1_pkg_setup
+	use python && python-single-r1_pkg_setup
+}
+
+src_prepare() {
+	# Set proper run directory
+	sed "s|\(PGSOCKET_DIR\s\+\)\"/tmp\"|\1\"${EPREFIX}/run/postgresql\"|" \
+		-i src/include/pg_config_manual.h || die
+
+	# Rely on $PATH being in the proper order so that the correct
+	# install program is used for modules utilizing PGXS in both
+	# hardened and non-hardened environments. (Bug #528786)
+	sed 's/@install_bin@/install -c/' -i src/Makefile.global.in || die
+
+	if use pam ; then
+		sed "s/\(#define PGSQL_PAM_SERVICE \"postgresql\)/\1-${SLOT}/" \
+			-i src/backend/libpq/auth.c || \
+			die 'PGSQL_PAM_SERVICE rename failed.'
+	fi
+
+	default
+}
+
+src_configure() {
+	lto-guarantee-fat
+
+	# Fails to build with C23, fallback to the old default in < GCC 15
+	# for now: https://marc.info/?l=pgsql-bugs&m=173185132906874&w=2
+	append-cflags -std=gnu17
+
+	case ${CHOST} in
+		*-darwin*|*-solaris*)
+			use nls && append-libs intl
+			;;
+	esac
+	export LDFLAGS_SL="${LDFLAGS}"
+	export LDFLAGS_EX="${LDFLAGS}"
+
+	local emesonargs=(
+		--prefix="${EPREFIX}/usr/$(get_libdir)/postgresql-${SLOT}"
+		--datadir="${EPREFIX}/usr/share/postgresql-${SLOT}"
+		--includedir="${EPREFIX}/usr/include/postgresql-${SLOT}"
+		--mandir="${EPREFIX}/usr/share/postgresql-${SLOT}/man"
+		--sysconfdir="${EPREFIX}/etc/postgresql-${SLOT}"
+		-Dsystem_tzdata="${EPREFIX}/usr/share/zoneinfo"
+		$(meson_feature icu)
+		$(meson_feature kerberos gssapi)
+		$(meson_feature ldap)
+		$(meson_feature llvm)
+		$(meson_feature lz4)
+		$(meson_feature nls)
+		$(meson_feature numa libnuma)
+		$(meson_feature oauth libcurl)
+		$(meson_feature pam)
+		$(meson_feature perl plperl)
+		$(meson_feature python plpython)
+		$(meson_feature readline)
+		$(meson_feature systemd)
+		$(meson_feature tcl pltcl)
+		$(meson_feature uring liburing)
+		$(meson_feature xml libxml)
+		$(meson_feature xml libxslt)
+		$(meson_feature zlib)
+		$(meson_feature zstd)
+	)
+
+	use debug && emesonargs+=( "--debug" )
+	use ssl && emesonargs+=( "-Dssl=openssl" )
+
+	local i uuid_config=""
+	if use uuid; then
+		for i in ${UTIL_LINUX_LIBC[@]}; do
+			use ${i} && uuid_config="-Duuid=e2fs"
+		done
+
+		emesonargs+=( ${uuid_config:-"-Duuid=ossp"} )
+	fi
+
+	meson_src_configure
+}
+
+src_compile() {
+	meson_src_compile
+
+	if use doc ; then
+		# Generates both manpages and HTML documentation.
+		meson_src_compile docs
+	else
+		meson_src_compile man
+	fi
+}
+
+src_test() {
+	if [[ ${UID} -ne 0 ]] ; then
+		# Some ICU tests fail if LC_CTYPE and LC_COLLATE aren't the same. We set
+		# LC_CTYPE to be equal to LC_COLLATE since LC_COLLATE is set by Portage.
+		local old_ctype=${LC_CTYPE}
+		export LC_CTYPE=${LC_COLLATE}
+		meson_src_test
+		export LC_CTYPE=${old_ctype}
+	else
+		ewarn 'Tests cannot be run as root. Enable "userpriv" in FEATURES.'
+		ewarn 'Skipping.'
+	fi
+}
+
+src_install() {
+	meson_src_install
+
+	sed -e "s|@SLOT@|${SLOT}|g" -e "s|@LIBDIR@|$(get_libdir)|g" \
+		"${FILESDIR}/${PN}.confd-9.3" | newconfd - "${PN}-${SLOT}"
+
+	sed -e "s|@SLOT@|${SLOT}|g" -e "s|@LIBDIR@|$(get_libdir)|g" \
+		"${FILESDIR}/${PN}.init-9.3-r1" | newinitd - "${PN}-${SLOT}"
+
+	insinto "/etc/postgresql-${SLOT}"
+	newins src/bin/psql/psqlrc.sample psqlrc
+
+	# Create slot specific links to their related executables, so that they're
+	# always available. For example, pg_config9999 is always available whereas
+	# the pg_config is controlled by postgresql.eselect.
+	local f bn
+	for f in $(find "${ED}/usr/$(get_libdir)/postgresql-${SLOT}/bin" \
+					-mindepth 1 -maxdepth 1)
+	do
+		bn=$(basename "${f}")
+		dosym "../$(get_libdir)/postgresql-${SLOT}/bin/${bn}" \
+			  "/usr/bin/${bn}${SLOT/.}"
+	done
+
+	# Create slot specific man pages so that they're always available. As above
+	# for the executables, make `man pg_config9999` always refer to the same
+	# manpage, whereas postgresql.eselect controls which manpage `man pg_config`
+	# refers.  And, since postgresql.eselect controls the manpages, doman would
+	# actually do the wrong thing for us, hence insinto and doins.
+	insinto "/usr/share/postgresql-${SLOT}/man/"
+	doins -r "${BUILD_DIR}"/doc/src/sgml/man{1,3,7}
+	docompress /usr/share/postgresql-"${SLOT}"/man/man{1,3,7}
+
+	local bn f mansec slotted_name
+	for mansec in 1 3 7 ; do
+		local rel_manpath="../../postgresql-${SLOT}/man/man${mansec}"
+
+		mkdir -p "${ED}"/usr/share/man/man${mansec} || die "making man dir"
+		pushd "${ED}"/usr/share/man/man${mansec} > /dev/null || die "pushd failed"
+
+		for f in "${ED}/usr/share/postgresql-${SLOT}/man/man${mansec}"/* ; do
+			bn=$(basename "${f}")
+			slotted_name=${bn%."${mansec}"}${SLOT}.${mansec}
+			case ${bn} in
+				TABLE.7|WITH.7)
+					echo ".so ${rel_manpath}/SELECT.7" > "${slotted_name}"
+					;;
+				*)
+					echo ".so ${rel_manpath}/${bn}" > "${slotted_name}"
+					;;
+			esac
+		done
+
+		popd > /dev/null || die "popd failed"
+	done
+
+	# All of the use flag influenced installs/removals begin here.
+	use doc && dodoc -r "${BUILD_DIR}"/doc/src/sgml/html
+
+	use pam && pamd_mimic system-auth "${PN}-${SLOT}" auth account session
+
+	if use prefix ; then
+		keepdir /run/postgresql
+		fperms 1775 /run/postgresql
+	fi
+
+	# Don't delete libpg{port,common}.a (Bug #571046). They're always
+	# needed by extensions utilizing PGXS.
+	use static-libs || \
+		find "${ED}" -name '*.a' ! -name libpgport.a ! -name libpgcommon.a \
+			 -delete
+	strip-lto-bytecode "${ED}"
+
+	if use systemd; then
+		newbin "${FILESDIR}/${PN}-check-db-dir" "${PN}-${SLOT}-check-db-dir"
+
+		sed -e "s|@SLOT@|${SLOT}|g" -e "s|@LIBDIR@|$(get_libdir)|g" \
+			"${FILESDIR}/${PN}.service-9.6-r1" | \
+			systemd_newunit - "${PN}-${SLOT}.service"
+		newtmpfiles "${FILESDIR}/${PN}.tmpfiles" "${PN}-${SLOT}.conf"
+	fi
+}
+
+pkg_postinst() {
+	use systemd && tmpfiles_process "${PN}-${SLOT}.conf"
+
+	# See comment in pkg_postrm().
+	[[ ${SLOT} = $(postgresql-config show) ]] && postgresql-config update
+
+	elog "Gentoo specific documentation:"
+	elog "https://wiki.gentoo.org/wiki/PostgreSQL"
+	elog
+	elog "Official documentation:"
+	if use doc ; then
+		elog "${EROOT}/usr/share/doc/${PF}/html"
+	else
+		elog "https://www.postgresql.org/docs/${SLOT/9999*/devel}/index.html"
+	fi
+	elog
+
+	elog "You can find release notes at:"
+	if use doc ; then
+		elog "${EROOT}/usr/share/doc/${PF}/html/release.html"
+	else
+		elog "https://www.postgresql.org/docs/${SLOT/9999*/devel}/release.html"
+	fi
+	elog
+
+	elog "If you need a global psqlrc-file, you can place it in:"
+	elog "    ${EROOT}/etc/postgresql-${SLOT}/"
+	elog
+	elog "The next two items only apply when running a server on this machine."
+	elog "------------------------------------------------------------------------"
+	elog "1. You may want to edit PG_INITDB_OPTS in the following file so that it"
+	elog "   contains your preferred locale, and other options, before"
+	elog "   initializing the cluster:"
+	elog "    ${EROOT}/etc/conf.d/postgresql-${SLOT}"
+	elog
+	elog "2. Then, run the following command to initialize database cluster:"
+	elog "    emerge --config =${CATEGORY}/${PN}:${SLOT}"
+}
+
+pkg_prerm() {
+	if [[ -z ${REPLACED_BY_VERSION} ]] ; then
+		ewarn "Were you running PostgreSQL ${SLOT} as a server? If no, ignore the rest"
+		ewarn "of this warning."
+		ewarn
+		ewarn "Have you dumped and/or migrated the ${SLOT} database cluster?"
+		ewarn "\thttps://wiki.gentoo.org/wiki/PostgreSQL/QuickStart#Migrating_PostgreSQL"
+
+		ebegin "Resuming removal in 10 seconds (Control-C to cancel)"
+		sleep 10
+		eend 0
+	fi
+}
+
+pkg_postrm() {
+	# The links managed by eselect are unversioned only, and would only be
+	# impacted if the selected slot and ebuild slot are the same. For example,
+	# if the selected slot is SLOT+1, then nothing that happened with this
+	# ebuild will impact the unversioned links.
+	[[ ${SLOT} = $(postgresql-config show) ]] && postgresql-config update
+}
+
+pkg_config() {
+	[[ -f "${EROOT}/etc/conf.d/postgresql-${SLOT}" ]] \
+		&& source "${EROOT}/etc/conf.d/postgresql-${SLOT}"
+	[[ -z "${PGDATA}" ]] && PGDATA="${EROOT}/etc/postgresql-${SLOT}/"
+	[[ -z "${DATA_DIR}" ]] \
+		&& DATA_DIR="${EROOT}/var/lib/postgresql/${SLOT}/data"
+
+	# environment.bz2 may not contain the same locale as the current system
+	# locale. Unset and source from the current system locale.
+	if [ -f "${EROOT}/etc/env.d/02locale" ]; then
+		unset LANG
+		unset LC_CTYPE
+		unset LC_NUMERIC
+		unset LC_TIME
+		unset LC_COLLATE
+		unset LC_MONETARY
+		unset LC_MESSAGES
+		unset LC_ALL
+		source "${EROOT}/etc/env.d/02locale"
+		[ -n "${LANG}" ] && export LANG
+		[ -n "${LC_CTYPE}" ] && export LC_CTYPE
+		[ -n "${LC_NUMERIC}" ] && export LC_NUMERIC
+		[ -n "${LC_TIME}" ] && export LC_TIME
+		[ -n "${LC_COLLATE}" ] && export LC_COLLATE
+		[ -n "${LC_MONETARY}" ] && export LC_MONETARY
+		[ -n "${LC_MESSAGES}" ] && export LC_MESSAGES
+		[ -n "${LC_ALL}" ] && export LC_ALL
+	fi
+
+	einfo "You can modify the paths and options passed to initdb by editing:"
+	einfo "    ${EROOT}/etc/conf.d/postgresql-${SLOT}"
+	einfo
+	einfo "Information on options that can be passed to initdb are found at:"
+	einfo "    https://www.postgresql.org/docs/${SLOT}/static/creating-cluster.html"
+	einfo "    https://www.postgresql.org/docs/${SLOT}/static/app-initdb.html"
+	einfo
+	einfo "PG_INITDB_OPTS is currently set to:"
+	if [[ -z "${PG_INITDB_OPTS}" ]] ; then
+		einfo "    (none)"
+	else
+		einfo "    ${PG_INITDB_OPTS}"
+	fi
+	einfo
+	einfo "Configuration files will be installed to:"
+	einfo "    ${PGDATA}"
+	einfo
+	einfo "The database cluster will be created in:"
+	einfo "    ${DATA_DIR}"
+	einfo
+
+	ebegin "Continuing initialization in 5 seconds (Control-C to cancel)"
+	sleep 5
+	eend 0
+
+	if [[ -n "$(ls -A ${DATA_DIR} 2> /dev/null)" ]] ; then
+		eerror "The given directory, '${DATA_DIR}', is not empty."
+		eerror "Modify DATA_DIR to point to an empty directory."
+		die "${DATA_DIR} is not empty."
+	fi
+
+	einfo "Creating the data directory ..."
+	if [[ ${EUID} == 0 ]] ; then
+		mkdir -p "$(dirname ${DATA_DIR%/})" || die "Couldn't parent dirs"
+		mkdir -m 0700 "${DATA_DIR%/}" || die "Couldn't make DATA_DIR"
+		chown -h postgres:postgres "${DATA_DIR%/}" || die "Couldn't chown"
+	fi
+
+	einfo "Initializing the database ..."
+
+	if [[ ${EUID} == 0 ]] ; then
+		su - postgres -c "${EROOT}/usr/$(get_libdir)/postgresql-${SLOT}/bin/initdb -D \"${DATA_DIR}\" ${PG_INITDB_OPTS}"
+	else
+		"${EROOT}"/usr/$(get_libdir)/postgresql-${SLOT}/bin/initdb -U postgres -D "${DATA_DIR}" ${PG_INITDB_OPTS}
+	fi
+
+	if [[ "${DATA_DIR%/}" != "${PGDATA%/}" ]] ; then
+		mv "${DATA_DIR%/}"/{pg_{hba,ident},postgresql}.conf "${PGDATA}"
+		ln -s "${PGDATA%/}"/{pg_{hba,ident},postgresql}.conf "${DATA_DIR%/}"
+	fi
+
+	# unix_socket_directory has no effect in postgresql.conf as it's
+	# overridden in the initscript
+	sed '/^#unix_socket_directories/,+1d' -i "${PGDATA%/}"/postgresql.conf
+
+	einfo "The autovacuum function, which was in contrib, has been moved to the main"
+	einfo "PostgreSQL functions starting with 8.1, and starting with 8.4 is now enabled"
+	einfo "by default. You can disable it in the cluster's:"
+	einfo "    ${PGDATA%/}/postgresql.conf"
+	einfo
+	if ! use systemd; then
+		einfo "The PostgreSQL server, by default, will log events to:"
+		einfo "    ${DATA_DIR%/}/postmaster.log"
+		einfo
+	fi
+	if use prefix ; then
+		einfo "The location of the configuration files have moved to:"
+		einfo "    ${PGDATA}"
+		einfo "To start the server:"
+		einfo "    pg_ctl start -D ${DATA_DIR} -o '-D ${PGDATA} --data-directory=${DATA_DIR}'"
+		einfo "To stop:"
+		einfo "    pg_ctl stop -D ${DATA_DIR}"
+		einfo
+		einfo "Or move the configuration files back:"
+		einfo "mv ${PGDATA}*.conf ${DATA_DIR}"
+	elif use systemd; then
+		einfo "You should use the 'postgresql-${SLOT}.service' unit to run PostgreSQL"
+		einfo "instead of 'pg_ctl'."
+	else
+		einfo "You should use the '${EROOT}/etc/init.d/postgresql-${SLOT}' script to run PostgreSQL"
+		einfo "instead of 'pg_ctl'."
+	fi
+}