diff --git a/dev-build/muon/Manifest b/dev-build/muon/Manifest
index 85cd97ea7ffc..8bf19adfa791 100644
--- a/dev-build/muon/Manifest
+++ b/dev-build/muon/Manifest
@@ -1,5 +1,7 @@
 DIST meson-tests-1e565931348f15f3f9b654f46ab4bf5fa009ca4f.tar.gz 229885 BLAKE2B d53bbc854da00c1a91189f6c4539da782f4ff49d2a57d86c56b9512b8b832f32d094d750055bb0602fe60aff58821e10c5f00663be9479420e29f75fbfba01c9 SHA512 25fdb657a17a33140029600d84cb3182e635749b99af85c432da611349c10576e15d2f79d1f9eaa21e3359b65dd057ef388925c54ebdc9c072e4b24bec3be8f8
 DIST muon-0.2.0.tar.gz 510533 BLAKE2B 6ec67f8875e84fbc2f23f412825dd47b820cd44e97a16d9ac0ab0ba9db6e755a604b66b79d3dbe13d99440daf21c2f0ccbe69661b1fb3c7df3f636c61a0e4dcb SHA512 b2e90048756bdc26bdea24fe227a87ad4d0e57176e217e22ea492a55229c62e2a70243f60af1e162e2dde8468fdda9662a32ea5cfadd69fab95a83499efa077b
 DIST muon-0.4.0-man.tar.gz 8006 BLAKE2B 0ce395ddbcccc83f5cdf8e74a7690fe0c0016ba28f7d6a05795e09833a03e8d7a281012ec2c26974b46d9883059623443034c86e08dd188458775ed2ad5fd8ae SHA512 d511ad3e3510092183993ac373ac09b6d47e9ab91ee6d5c6c98c5051eb059cef99762065cd1b24b4b45fe2a242768666ca968ab270d824ce9b74ff24799d0bdc
+DIST muon-0.5.0-man.tar.gz 8172 BLAKE2B aff24024050f8834bc024c87a4b8f599be376651c156bd9702c804175fd0aaa941a7eb2f0fd29c7016145c67dae17e48ecfd69ee286e3ba2be9147aa5faf6e00 SHA512 3d8973ab907838be6f40532983536023e280ed9624da003eb278ecbd5cd9f17b067d74a6646b6eecff0ebbd6de4b6a53f78e96a9f7c13d436543569d91c05b17
 DIST muon-v0.3.0.tar.gz 688544 BLAKE2B 6f5e9f91c1221135d8452b54bd781fb4324586d88503579af243c9889e17330d3d746a0e9fa4480a98d36ec5d55d1c335813bd19da81eaf2ef40dda42d32c418 SHA512 10d8d3d8d5df3898de22ed43fef234766e1884561d797a6462d614fd7be0f22eb7bbf40e096fe44d3e58f72e1fc631ef510f53a1e8ec36d4602ad7d5fe2771b3
 DIST muon-v0.4.0.tar.gz 3435753 BLAKE2B 0eb685ebd22a6314cfa02ab716ae8a1899363d1ce4dc6fd0b42a3fab1ff62358d21abd6c6d2682a78df1fffd2d6cc72abaacfa7eb5174a10d50bdd5dbbf0825c SHA512 2ab817bfe886fff5a9cd00935f19c7c73cc4556aa11a538ca496bdad4cced4dc1608efd05d58b6971640d0543bd7d4486185ed93a26522690cf2e1d348342bb8
+DIST muon-v0.5.0.tar.gz 1262546 BLAKE2B e43c12a3558108a2b3c35438db8cbf38fec50974f63392c32a48a76273c1896a2347bc475fb0e9282b85a3128367006840da3bfb1f9b49359428fe467e0744b1 SHA512 1575aa928b88fd5f17c1cdf9f46359b4dde407ec11800813eb1c9d4b4a4d201f6ee0a715d2e6f693bf6dda63073980a7207086d4195e51eda96dd27af3319078
diff --git a/dev-build/muon/files/muon-0.5.0-workaround-meson-15093.patch b/dev-build/muon/files/muon-0.5.0-workaround-meson-15093.patch
new file mode 100644
index 000000000000..24d85513edb2
--- /dev/null
+++ b/dev-build/muon/files/muon-0.5.0-workaround-meson-15093.patch
@@ -0,0 +1,28 @@
+Workaround for a meson bug: https://github.com/mesonbuild/meson/issues/15093
+
+diff --git i/tests/project/meson.build w/tests/project/meson.build
+index f409198d..b582d83b 100644
+--- i/tests/project/meson.build
++++ w/tests/project/meson.build
+@@ -45,7 +45,7 @@ foreach t : tests
+     endif
+
+     test_source = props.get('source_root', meson.current_source_dir()) / name
+-    kwargs = props.get('kwargs', {})
++    kwargs = props.get('kwargs_', {})
+     suites = ['project', name.split('/')[0]]
+
+     # skip objc tests on non darwin platforms
+diff --git i/subprojects/meson-tests/meson.build w/subprojects/meson-tests/meson.build
+index 861e57b..eb540a2 100644
+--- i/subprojects/meson-tests/meson.build
++++ w/subprojects/meson-tests/meson.build
+@@ -252,7 +252,7 @@ foreach t : [
+     ['common/235 invalid standard overridden to valid'],
+     [
+         'common/236 proper args splitting',
+-        {'kwargs': {'env': {'CFLAGS': '-DFOO -DBAR'}}},
++        {'kwargs_': {'env': {'CFLAGS': '-DFOO -DBAR'}}},
+     ],
+     ['common/237 fstrings'],
+     ['common/238 dependency include_type inconsistency'],
diff --git a/dev-build/muon/muon-0.5.0.ebuild b/dev-build/muon/muon-0.5.0.ebuild
new file mode 100644
index 000000000000..8b9da0409aad
--- /dev/null
+++ b/dev-build/muon/muon-0.5.0.ebuild
@@ -0,0 +1,66 @@
+# Copyright 2022-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit meson
+
+DESCRIPTION="A meson-compatible build system"
+HOMEPAGE="https://muon.build/"
+SRC_URI="
+	https://muon.build/releases/v${PV}/${PN}-v${PV}.tar.gz
+	https://muon.build/releases/v${PV}/docs/man.tar.gz -> ${P}-man.tar.gz
+"
+S="${WORKDIR}/${PN}-v${PV}"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86"
+IUSE="+archive +curl +libpkgconf test"
+
+DEPEND="
+	curl? ( net-misc/curl )
+	archive? ( app-arch/libarchive:= )
+	libpkgconf? ( dev-util/pkgconf:= )
+"
+RDEPEND="${DEPEND}"
+BDEPEND="
+	test? ( dev-util/gdbus-codegen )
+"
+RESTRICT="!test? ( test )"
+
+PATCHES=(
+	"${FILESDIR}/${PN}"-0.5.0-workaround-meson-15093.patch
+)
+
+src_configure() {
+	cat >"${T}/program-file.ini" <<-EOF
+	[binaries]
+	git = 'if this exists youre a bad person'
+	EOF
+	local emesonargs=(
+		--native-file="${T}/program-file.ini"
+		$(meson_feature curl libcurl)
+		$(meson_feature archive libarchive)
+		$(meson_feature libpkgconf)
+		-Dman-pages=disabled
+		-Dmeson-docs=disabled
+		-Dtracy=disabled    # not in repos
+		-Dsamurai=disabled  # patched version of samurai downloaded via wraps
+		-Dreadline=bestline # small vendored dependency
+		-Dwebsite=disabled  # unneeded
+		-Dui=disabled       # too many vendored depdendencies
+
+		# Pulled into the right directory above.
+		$(meson_feature test meson-tests)
+	)
+	meson_src_configure
+}
+
+src_install() {
+	meson_install
+
+	einstalldocs
+	doman "${WORKDIR}/man/muon.1"
+	doman "${WORKDIR}/man/meson.build.5"
+}