diff --git a/dev-util/mdds/Manifest b/dev-util/mdds/Manifest
index b1e2412f89ade..8ddfc863847cb 100644
--- a/dev-util/mdds/Manifest
+++ b/dev-util/mdds/Manifest
@@ -1 +1,2 @@
 DIST mdds-2.1.1.tar.xz 540732 BLAKE2B d549bf5c39db6b8ec738cca2833545fef48ffd0b603c2c97dd425ae89bd5368a6981fb75bd4cbf90c9cf09efc7116a4e485c843bb2200fc198d23a02dbdd6559 SHA512 5fe345e7d84d2e290a519d65b27332f69001c01da961c05a30abfe2a17cb8545822490bcd63b320d49e1b26291a4a898f77495951919aece83208133027848ea
+DIST mdds-3.0.0.tar.xz 635852 BLAKE2B 67a10991409d92dfbae97242dcf0925936587f037b496bd3448b8f7c8fe5e1a5574fc29d7b89342750cb50dce3ce6eee1da9ce628987a3d2ad9260a23a904061 SHA512 c6b6be808a6b4a44ce41bf7e28cfe8c5bd3c5ede70dab808d1361b61ee51604750c5d47c46bf3e9bbdce6260311f4e5845afad158d2d1b3d9c349beae9611491
diff --git a/dev-util/mdds/files/mdds-3.0.0-buildsystem.patch b/dev-util/mdds/files/mdds-3.0.0-buildsystem.patch
new file mode 100644
index 0000000000000..ce4816d94dc71
--- /dev/null
+++ b/dev-util/mdds/files/mdds-3.0.0-buildsystem.patch
@@ -0,0 +1,41 @@
+# Nils Freydank <holgersson@posteo.de> (2020-01-08)
+Avoid auto installation of files we install later manually.
+Adopted from asturm's patch for mdds-1.4.3.
+
+diff --git a/Makefile.am b/Makefile.am
+index 9b69455b..010c7826 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -7,7 +7,6 @@ AM_CPPFLAGS = \
+ 	-I$(top_srcdir)/test/include \
+ 	$(CXXFLAGS_UNITTESTS)
+ 
+-dist_doc_DATA = AUTHORS README.md
+ nodist_pkgconf_DATA = misc/mdds-@API_VERSION@.pc
+ 
+ DISTCLEANFILES = \
+@@ -15,8 +14,6 @@ DISTCLEANFILES = \
+ 
+ EXTRA_DIST = \
+ 	autogen.sh \
+-	CHANGELOG \
+-	LICENSE \
+ 	doc/_static/images/fst-example1-initial.svg \
+ 	doc/_static/images/fst-example1-insert1.svg \
+ 	doc/_static/images/fst-example1-insert2.svg \
+@@ -95,14 +92,6 @@ EXTRA_DIST = \
+ 	misc/sorted_string_data.dat \
+ 	misc/sorted_string_map_perf.cpp
+ 
+-install-data-local:
+-	$(MKDIR_P) $(DESTDIR)$(docdir)
+-	$(INSTALL_DATA) $(top_srcdir)/LICENSE $(DESTDIR)$(docdir)/COPYING
+-	$(INSTALL_DATA) $(top_srcdir)/CHANGELOG $(DESTDIR)$(docdir)/NEWS
+-
+-uninstall-local:
+-	rm -f $(DESTDIR)$(docdir)/COPYING $(DESTDIR)$(docdir)/NEWS
+-
+ if BUILD_DOCS
+ 
+ doc-doxygen:
+
diff --git a/dev-util/mdds/files/mdds-3.0.0-include.patch b/dev-util/mdds/files/mdds-3.0.0-include.patch
new file mode 100644
index 0000000000000..6bd5477d08ad1
--- /dev/null
+++ b/dev-util/mdds/files/mdds-3.0.0-include.patch
@@ -0,0 +1,19 @@
+https://gitlab.com/mdds/mdds/-/commit/7c414ddc0bd2fae590cc09944579e90d822d9e0b
+
+From 7c414ddc0bd2fae590cc09944579e90d822d9e0b Mon Sep 17 00:00:00 2001
+From: Gwyn Ciesla <gwync@protonmail.com>
+Date: Tue, 28 Jan 2025 13:33:22 -0600
+Subject: [PATCH] Fix build with most recent gcc/glibc
+
+--- a/include/mdds/trie_map.hpp
++++ b/include/mdds/trie_map.hpp
+@@ -37,6 +37,7 @@
+ #include <map>
+ #include <memory>
+ #include <limits>
++#include <cstdint>
+ 
+ namespace mdds {
+ 
+-- 
+GitLab
diff --git a/dev-util/mdds/mdds-3.0.0.ebuild b/dev-util/mdds/mdds-3.0.0.ebuild
new file mode 100644
index 0000000000000..4bb9c8b2b25ec
--- /dev/null
+++ b/dev-util/mdds/mdds-3.0.0.ebuild
@@ -0,0 +1,64 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+if [[ ${PV} == *9999* ]]; then
+	EGIT_REPO_URI="https://gitlab.com/mdds/mdds.git"
+	inherit git-r3
+else
+	# For 3.0.0, it mysteriously redirects to 2.0.0
+	#SRC_URI="https://kohei.us/files/${PN}/src/${P}.tar.xz"
+	SRC_URI="https://gitlab.com/api/v4/projects/mdds%2Fmdds/packages/generic/source/${PV}/${P}.tar.xz"
+	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~x86 ~amd64-linux ~x86-linux"
+fi
+inherit autotools toolchain-funcs
+
+DESCRIPTION="Collection of multi-dimensional data structure and indexing algorithm"
+HOMEPAGE="https://gitlab.com/mdds/mdds"
+
+LICENSE="MIT"
+SLOT="1/3.0" # Check API version on version bumps!
+IUSE="doc openmp test"
+RESTRICT="!test? ( test )"
+
+DEPEND="dev-libs/boost:="
+RDEPEND="${DEPEND}"
+BDEPEND="
+	doc? (
+		app-text/doxygen
+		dev-python/sphinx
+	)
+	test? ( dev-util/dejagnu )
+"
+
+PATCHES=(
+	"${FILESDIR}/${PN}-3.0.0-buildsystem.patch"
+	"${FILESDIR}/${P}-include.patch"
+)
+
+pkg_pretend() {
+	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
+}
+
+pkg_setup() {
+	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
+}
+
+src_prepare() {
+	default
+	eautoreconf
+}
+
+src_configure() {
+	local myeconfargs=(
+		$(use_enable doc docs)
+		$(use_enable openmp)
+	)
+	econf "${myeconfargs[@]}"
+}
+
+src_test() {
+	tc-export CXX
+	default
+}
diff --git a/dev-util/mdds/mdds-9999.ebuild b/dev-util/mdds/mdds-9999.ebuild
index 420358f97a959..f4fcc56bded0b 100644
--- a/dev-util/mdds/mdds-9999.ebuild
+++ b/dev-util/mdds/mdds-9999.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -7,7 +7,9 @@ if [[ ${PV} == *9999* ]]; then
 	EGIT_REPO_URI="https://gitlab.com/mdds/mdds.git"
 	inherit git-r3
 else
-	SRC_URI="https://kohei.us/files/${PN}/src/${P}.tar.xz"
+	# For 3.0.0, it mysteriously redirects to 2.0.0
+	#SRC_URI="https://kohei.us/files/${PN}/src/${P}.tar.xz"
+	SRC_URI="https://gitlab.com/api/v4/projects/mdds%2Fmdds/packages/generic/source/${PV}/${P}.tar.xz"
 	KEYWORDS="~amd64 ~arm ~arm64 ~loong ~ppc ~ppc64 ~riscv ~x86 ~amd64-linux ~x86-linux"
 fi
 inherit autotools toolchain-funcs
@@ -30,7 +32,9 @@ BDEPEND="
 	test? ( dev-util/dejagnu )
 "
 
-PATCHES=( "${FILESDIR}/${PN}-1.5.0-buildsystem.patch" )
+PATCHES=(
+	"${FILESDIR}/${PN}-3.0.0-buildsystem.patch"
+)
 
 pkg_pretend() {
 	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp