diff --git a/games-strategy/0ad/0ad-0.27.1.ebuild b/games-strategy/0ad/0ad-0.27.1.ebuild
new file mode 100644
index 0000000000000..14e7b3101d37b
--- /dev/null
+++ b/games-strategy/0ad/0ad-0.27.1.ebuild
@@ -0,0 +1,239 @@
+# Copyright 2014-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{12,13} )
+WX_GTK_VER="3.2-gtk3"
+inherit desktop flag-o-matic python-any-r1 toolchain-funcs multiprocessing wxwidgets xdg
+
+if [[ ${PV} != 9999 && ${PV} != *_pre* ]]; then
+	VERIFY_SIG_METHOD=minisig
+	# The public key can be found upstream - last update was w/ alpha 26:
+	# https://gitea.wildfiregames.com/0ad/0ad/wiki/VerifyingYourDownloads
+	VERIFY_SIG_OPENPGP_KEY_PATH=${FILESDIR}/0ad-minisign.pub
+	inherit verify-sig
+fi
+
+DESCRIPTION="A free, real-time strategy game"
+HOMEPAGE="https://play0ad.com/"
+LICENSE="BitstreamVera CC-BY-SA-3.0 GPL-2 LGPL-2.1 LPPL-1.3c MIT ZLIB"
+
+if [[ ${PV} == *9999 ]]; then
+	inherit git-r3
+	EGIT_REPO_URI="https://github.com/0ad/0ad"
+	S="${WORKDIR}/${P}"
+elif [[ ${PV} == *_pre* ]]; then
+	ZEROAD_GIT_REVISION=""
+	SRC_URI="https://github.com/0ad/0ad/archive/${ZEROAD_GIT_REVISION}.tar.gz -> ${P}.tar.gz"
+	S="${WORKDIR}/${PN}-${ZEROAD_GIT_REVISION}"
+elif [[ ${PV} == *_rc* ]]; then
+	MY_P="0ad-${PV/_/-}"
+	SRC_URI="
+		https://releases.wildfiregames.com/rc/${MY_P}-unix-build.tar.xz
+		https://releases.wildfiregames.com/rc/${MY_P}-unix-data.tar.xz
+		verify-sig? (
+			https://releases.wildfiregames.com/rc/${MY_P}-unix-build.tar.xz.minisig
+			https://releases.wildfiregames.com/rc/${MY_P}-unix-data.tar.xz.minisig
+		)
+	"
+	S="${WORKDIR}/${MY_P/-rc*/}"
+else
+	MY_P="0ad-${PV/_/-}"
+	SRC_URI="
+		https://releases.wildfiregames.com/${MY_P}-unix-build.tar.xz
+		https://releases.wildfiregames.com/${MY_P}-unix-data.tar.xz
+		verify-sig? (
+			https://releases.wildfiregames.com/${MY_P}-unix-build.tar.xz.minisig
+			https://releases.wildfiregames.com/${MY_P}-unix-data.tar.xz.minisig
+		)
+	"
+	S="${WORKDIR}/${MY_P}"
+fi
+SLOT="0"
+KEYWORDS="~amd64 ~arm64 ~ppc64 ~x86"
+IUSE="editor +lobby nvtt pch test"
+
+RESTRICT="!test? ( test )"
+CHECKREQS_DISK_BUILD="4000M" # 3842680 KiB (3.6 GiB) for alpha 27
+CHECKREQS_DISK_USR="3500M" # 3452564 KiB (3.2 GiB)
+
+BDEPEND="
+	>=dev-util/premake-5.0.0_alpha12:5
+	<dev-util/premake-5.0.0_beta5:5
+	virtual/pkgconfig
+	test? ( ${PYTHON_DEPS} )
+"
+
+# Removed dependency on nvtt as we use the bundled one.
+# bug #768930
+# TODO: use system cxxtest
+DEPEND="
+	dev-lang/spidermonkey:115
+	dev-libs/boost:=
+	dev-libs/icu:=
+	dev-libs/libfmt:0=
+	dev-libs/libsodium:=
+	dev-libs/libxml2:=
+	media-libs/freetype
+	media-libs/libpng:0
+	media-libs/libsdl2[X,opengl,video]
+	media-libs/libvorbis
+	media-libs/openal
+	net-libs/enet:1.3
+	net-libs/miniupnpc:=
+	net-misc/curl
+	sys-libs/zlib
+	virtual/opengl
+	x11-libs/libX11
+	editor? ( x11-libs/wxGTK:${WX_GTK_VER}=[X,opengl] )
+	lobby? ( net-libs/gloox )
+"
+RDEPEND="
+	${DEPEND}
+"
+
+PATCHES=(
+	# https://gitea.wildfiregames.com/0ad/0ad/issues/7534
+	"${FILESDIR}/${PN}-0.27.0-fix-tests.patch"
+	# https://gitea.wildfiregames.com/0ad/0ad/issues/8471
+	"${FILESDIR}/${PN}-0.27.1-fix-boost-compat.patch"
+)
+
+src_prepare() {
+	default
+
+	# bundled nvtt: -Wodr
+	filter-lto
+
+	# Originally from 0ad-data
+	rm binaries/data/tools/fontbuilder/fonts/*.txt || die
+
+	# Delete test needing network access
+	rm source/network/tests/test_StunClient.h || die
+}
+
+src_configure() {
+	# 0AD uses premake:5 to generate the Makefiles, so let's
+	# 1. configure the configure args,
+	# 2. export some toolchain args,
+	# 3. configure premake args,
+	# 4. run premake5.
+	local myconf=(
+		--minimal-flags
+		--with-system-mozjs
+		$(usex nvtt "" "--without-nvtt")
+		$(usex pch "" "--without-pch")
+		$(usex test "" "--without-tests")
+		$(usex editor "" "--without-atlas")
+		$(usex lobby "" "--without-lobby")
+		--bindir="/usr/bin"
+		--libdir="/usr/$(get_libdir)"/${PN}
+		--datadir="/usr/share/${PN}"
+	)
+
+	tc-export AR CC CXX PKG_CONFIG RANLIB
+
+	local mypremakeargs=(
+		--file=build/premake/premake5.lua
+		--os=linux
+		--verbose
+	)
+
+	use editor && setup-wxwidgets
+
+	premake5 "${mypremakeargs[@]}" "${myconf[@]}" gmake2 \
+		|| die "Premake failed"
+}
+
+src_compile() {
+	# Build 3rd party fcollada
+	einfo "Building bundled fcollada"
+	JOBS="-j$(makeopts_jobs)" ./libraries/source/fcollada/build.sh || die "Failed to build bundled fcollada"
+
+	# Build bundled NVTT
+	# nvtt is abandoned upstream and 0ad has forked it and added fixes.
+	# Use their copy. bug #768930
+	if use nvtt; then
+		elog "Building bundled NVTT (bug #768930)"
+		JOBS="-j$(makeopts_jobs)" ./libraries/source/nvtt/build.sh || die "Failed to build bundled NVTT"
+	fi
+
+	# Shouldn't be needed with tests disabled, unfortunatly it still is for a27
+	# https://gitea.wildfiregames.com/0ad/0ad/issues/7537
+	einfo "Building bundled cxxtest"
+	JOBS="-j$(makeopts_jobs)" ./libraries/source/cxxtest-4.4/build.sh || die "Failed to build bundled cxxtest"
+
+	# Build 0ad itself!
+	elog "Building 0ad"
+	emake -C build/workspaces/default config=release verbose=1
+
+	# Build assets
+	# (We only do this if we're using a snapshot/non-release)
+	# See bug #771147 (comment 3) and the old 0ad-data ebuild
+	# Warning: fragile!
+	if [[ ${PV} == 9999 || ${PV} == *_pre* ]]; then
+		# source/lib/sysdep/os/linux/ldbg.cpp:debug_SetThreadName() tries to open /proc/self/task/${TID}/comm for writing.
+		addpredict /proc/self/task
+
+		# Based on source/tools/dist/build-archives.sh used by source/tools/dist/build.sh.
+		local archivebuild_input archivebuild_output mod_name
+		for archivebuild_input in binaries/data/mods/[A-Za-z0-9]*; do
+			mod_name="${archivebuild_input##*/}"
+			archivebuild_output="archives/${mod_name}"
+
+			mkdir -p "${archivebuild_output}" || die
+
+			einfo pyrogenesis -archivebuild="${archivebuild_input}" \
+				-archivebuild-output="${archivebuild_output}/${mod_name}.zip"
+			LD_LIBRARY_PATH="binaries/system" binaries/system/pyrogenesis \
+				-archivebuild="${archivebuild_input}" \
+				-archivebuild-output="${archivebuild_output}/${mod_name}.zip" \
+			|| die "Failed to build assets"
+
+			if [[ -f "${archivebuild_input}/mod.json" ]]; then
+				cp "${archivebuild_input}/mod.json" "${archivebuild_output}" || die
+			fi
+
+			rm -r "${archivebuild_input}" || die
+			mv "${archivebuild_output}" "${archivebuild_input}" || die
+		done
+
+		# Based on source/tools/dist/build-unix-win32.sh used by source/tools/dist/build.sh.
+		rm binaries/data/config/dev.cfg || die
+	fi
+}
+
+# Removed test requiring network access in src_configure
+src_test() {
+	LD_LIBRARY_PATH=$(realpath libraries/source/nvtt/lib/) \
+		./binaries/system/test --libdir "${S}/binaries/system" || die "Failed tests"
+}
+
+src_install() {
+	# Remove font files only used to generate font bitmaps
+	rm -r binaries/data/tools/fontbuilder/ || die
+	# Remove transifex tooling configuration
+	rm -r binaries/data/l10n/{.tx,messages.json} || die
+	# Remove test only data
+	rm -r binaries/data/mods/_test.* || die
+
+	newbin binaries/system/pyrogenesis 0ad
+	use editor && newbin binaries/system/ActorEditor 0ad-ActorEditor
+
+	# Merged from 0ad-data
+	# bug #771147 (comment 3)
+	insinto /usr/share/${PN}
+	doins -r binaries/data/{l10n,config,mods,tools}
+
+	# Install bundled nvtt
+	# bug #771147 (comment 1)
+	exeinto /usr/$(get_libdir)/${PN}
+	doexe binaries/system/libCollada.so
+	use nvtt && doexe libraries/source/nvtt/lib/{libnvtt,libnvcore,libnvimage,libnvmath}.so
+	use editor && doexe binaries/system/libAtlasUI.so
+
+	dodoc binaries/system/readme.txt
+	doicon -s 128 build/resources/${PN}.png
+	make_desktop_entry ${PN}
+}
diff --git a/games-strategy/0ad/Manifest b/games-strategy/0ad/Manifest
index 6a43b7ed95fb6..c477081f1d35c 100644
--- a/games-strategy/0ad/Manifest
+++ b/games-strategy/0ad/Manifest
@@ -2,3 +2,7 @@ DIST 0ad-0.27.0-unix-build.tar.xz 152170976 BLAKE2B 85ff5b8090791cc2b8fd32cd86c5
 DIST 0ad-0.27.0-unix-build.tar.xz.minisig 327 BLAKE2B c8cfc6654f1fb04f513512fa6dd9168864434ca15a77584a670d294a8d667529b43ba26779aba763354b069dd1893ce85af856e382fc41d11493ec5af769fc06 SHA512 cb791abdc8076a6e9823f1d732869c3757277f2980b42c028638bf7ee98e04cf65614fc93dc56e6b4ae8287826e02338d9746d0cc228d23922f2d005db94f459
 DIST 0ad-0.27.0-unix-data.tar.xz 1367701984 BLAKE2B d9e745352c792a959b4a2e04ac833bebf29f86de14abe17e5dbfd4a7e4dfeb4d0cdf7487304fec5bff7041995d7f471abf09cd9295386f2eb9932efd9abf67fb SHA512 744be28da72c155591ee1780e9b6ed679ba4dbb3a991ed5e9faf6cb3dec769323c73cf8fec343743834491433166bb19b7bb4085da1a3e033b5e06fde001a27f
 DIST 0ad-0.27.0-unix-data.tar.xz.minisig 326 BLAKE2B d04c309499af9ede76cf5b09d014de36360f6bf3e3b0018bb890be6eac2a05dc21abd4c25f607dec812ffaf660da91b0e8455f8e10d93205518c672a5f7dccaf SHA512 bcea286152b99cf01b526c587b5df2f33c23326512a59dc02b40e743aafa04716b42da6f6adf1457485e969ab834015f02a96c06aa84ffede62a15a1b3be14f1
+DIST 0ad-0.27.1-unix-build.tar.xz 153554512 BLAKE2B b593a86e6deaeb747d6f2f3b13d0c1e3b5f8f69d7ea181f5f17564d940bc5ce90a53e5513cfab0f97f552f0b53d7f7cda9dc805258545fe2d0f31675028cdda3 SHA512 7ddc355afed44511f3c62bb4119e308f921fc9624980a3171853d923042777eeb248a1ce326d3768f23596d75e8346025321d7d72d6fa3b1106a5818ca62b40d
+DIST 0ad-0.27.1-unix-build.tar.xz.minisig 323 BLAKE2B 0195cbd966cffa3b2a75eeed6a30d6e65906c7ff5c5435b015716e81ce0636cf04926a7d079ee3a0b5e28268a82cf4a9c75ceac835bf4195f6d489fdf57238e4 SHA512 5ffb716aea31e7c4d7a4a49f4fca05b74d2b31d6b4f467d1c53597e35e792c124563aa603ca6f44f989a931b9bbddb0e830381c1b0ffdb3902dd54e25db472bf
+DIST 0ad-0.27.1-unix-data.tar.xz 1367955136 BLAKE2B 508d43fba489ffdd1d6b5b51127d4a92a75f7b086f10d5673fddb99a33ff9d5007b393ec0e53e97b1401c0cc21794c00cdcab052023be715add29f3a35bc6981 SHA512 8d286d4c39bd79f634a71a7959cbc407299ffc1ad53fa27be0fca94195360d8a0c238f64137c1e32a4b5ba66a3a11b86aa8eeed8501253e91ec4767f1054a1d3
+DIST 0ad-0.27.1-unix-data.tar.xz.minisig 322 BLAKE2B 143d51b6c6c76f4d4a3410a5fb434724b08d5865a454b80b9e7b24540140392c92824918291149a29d8492b36c4e77206f34f68bec01a8b5907b0ee77d68a2dd SHA512 767d8d1c1159dceefb1712883130500f9e5808d3950766fe3e15a101c459d9d29afcbe4222d95809fa0dad759c253ff94394309d2f3ebd3fd5b8a49ff91bd37e
diff --git a/games-strategy/0ad/files/0ad-0.27.1-fix-boost-compat.patch b/games-strategy/0ad/files/0ad-0.27.1-fix-boost-compat.patch
new file mode 100644
index 0000000000000..069411c94edd9
--- /dev/null
+++ b/games-strategy/0ad/files/0ad-0.27.1-fix-boost-compat.patch
@@ -0,0 +1,41 @@
+From 4c62138ce29c19911347ac15e264f4edced85a9c Mon Sep 17 00:00:00 2001
+From: Ralph Sennhauser <ralph.sennhauser@gmail.com>
+Date: Sat, 18 Oct 2025 19:57:09 +0200
+Subject: [PATCH] Fix building against boost >=1.89
+
+In boost-1.89 boost_system is a header-only library [1].
+
+[1] https://github.com/boostorg/system/commit/7a495bb46d7ccd808e4be2a6589260839b0fd3a3
+
+Fixes: #8471
+Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
+---
+ build/premake/extern_libs5.lua | 12 +++++++++++-
+ 1 file changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/build/premake/extern_libs5.lua b/build/premake/extern_libs5.lua
+index 4f51c2c0ed..dc53bc7772 100644
+--- a/build/premake/extern_libs5.lua
++++ b/build/premake/extern_libs5.lua
+@@ -235,7 +235,17 @@ extern_lib_defs = {
+ 				-- The following are not strictly link dependencies on all systems, but
+ 				-- are included for compatibility with different versions of Boost
+ 				android_names = { "boost_filesystem-gcc-mt", "boost_system-gcc-mt" },
+-				unix_names = { os.findlib("boost_filesystem-mt") and "boost_filesystem-mt" or "boost_filesystem", os.findlib("boost_system-mt") and "boost_system-mt" or "boost_system" },
++				unix_names = {
++					os.findlib("boost_filesystem-mt") and "boost_filesystem-mt" or "boost_filesystem",
++					-- boost_system is header-only in boost >=1.89
++					(function()
++						if os.findlib("boost_system-mt") then
++							return "boost_system-mt"
++						elseif os.findlib("boost_system-mt") then
++							return "boost_system"
++						end
++					end)()
++				},
+ 				osx_names = { "boost_filesystem", "boost_system" },
+ 			})
+ 		end,
+-- 
+2.51.0
+