diff --git a/sci-libs/klu/Manifest b/sci-libs/klu/Manifest
index 0e6da4f951095..6f008e22cc8a1 100644
--- a/sci-libs/klu/Manifest
+++ b/sci-libs/klu/Manifest
@@ -1,2 +1,3 @@
 DIST SuiteSparse-7.0.0.gh.tar.gz 64884962 BLAKE2B 06c6cf54ffae188f5179e0cd45523700448d8999b44d6b1aeb3dfb99ccf34a570f6aff600988a144c68a4a2d8f41e32f7145e09349aed3bd889501ea031c8340 SHA512 50b1cd7bab6e4c063984162ed803fd13b69df7f67efe8ce7af15eace6b0ccd1669b6e57daa59511fd9531a847433cda49c1f52bfff234031af0d79e7fbd6423e
+DIST SuiteSparse-7.12.2.gh.tar.gz 95337908 BLAKE2B df279ccc572887ecda2809551eefd34d0780b9cfef5c257c6c9f218dbcc5140f44e148a8199ebe899984561bb454b1f202606f8af290d71f5caeef4c008659c4 SHA512 0a7d070c90ef0a55c3ed821edf6567f4a84d5615250898b8fbacad19e1cf53dba199c38369c771465b4149ba5501bf0c1ae1352f29d0fb462fd10ca90e486cfa
 DIST klu-1.3.9.tar.bz2 635596 BLAKE2B 6c6c84cf1b30e78cbaaee6bebed21c806d1672bee5f7ea061e7ef057ff56fd456e8517ca2ff1018a14ebcbc8f96b9e87989e22d8996817394666e6d8d2d727dd SHA512 b7fd862fe8443596758c27f9c918e367b3b3816340836e74cf8d97a2e755fbe07d133778eea3d054bc70243fa15c2bd71f4fd90c1179879661ba2d624b8f0706
diff --git a/sci-libs/klu/klu-2.3.6.ebuild b/sci-libs/klu/klu-2.3.6.ebuild
new file mode 100644
index 0000000000000..01dc380dba1a9
--- /dev/null
+++ b/sci-libs/klu/klu-2.3.6.ebuild
@@ -0,0 +1,80 @@
+# Copyright 1999-2026 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake
+
+Sparse_PV="7.12.2"
+Sparse_P="SuiteSparse-${Sparse_PV}"
+DESCRIPTION="Sparse LU factorization for circuit simulation"
+HOMEPAGE="https://people.engr.tamu.edu/davis/suitesparse.html"
+SRC_URI="https://github.com/DrTimothyAldenDavis/SuiteSparse/archive/refs/tags/v${Sparse_PV}.tar.gz -> ${Sparse_P}.gh.tar.gz"
+
+S="${WORKDIR}/${Sparse_P}/${PN^^}"
+LICENSE="LGPL-2.1+"
+SLOT="0/2"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~mips ~ppc ~ppc64 ~riscv ~sparc ~x86"
+IUSE="doc test"
+RESTRICT="!test? ( test )"
+
+DEPEND=">=sci-libs/suitesparseconfig-${Sparse_PV}
+	>=sci-libs/amd-3.3.4
+	>=sci-libs/btf-2.3.3
+	>=sci-libs/colamd-3.3.5
+	>=sci-libs/cholmod-5.3.4"
+RDEPEND="${DEPEND}"
+BDEPEND="doc? ( virtual/latex-base )"
+
+src_configure() {
+	# Define SUITESPARSE_INCLUDEDIR_POSTFIX to "" otherwise it take
+	# the value suitesparse, and the include directory would be set to
+	# /usr/include/suitesparse
+	# This need to be set in all suitesparse ebuilds.
+	local mycmakeargs=(
+		-DBUILD_STATIC_LIBS=OFF
+		-DSUITESPARSE_DEMOS=$(usex test)
+		-DSUITESPARSE_INCLUDEDIR_POSTFIX=""
+	)
+	cmake_src_configure
+}
+
+src_test() {
+	# Because we are not using cmake_src_test,
+	# we have to manually go to BUILD_DIR
+	cd "${BUILD_DIR}" || die
+	# Run demo files
+	local dtype=(
+		demo
+		ldemo
+	)
+	local samples=(
+		1c.mtx
+		arrowc.mtx
+		arrow.mtx
+		impcol_a.mtx
+		w156.mtx
+		ctina.mtx
+	)
+	./klu_simple || die "klu_simple failed to run"
+	local i
+	local j
+	for i in ${dtype[@]}; do
+		for j in ${samples[@]}; do
+			./klu${i} < "${S}/Matrix/${j}" || die "failed testing klu${i} with ${j}"
+		done
+	done
+	einfo "All tests passed"
+}
+
+src_install() {
+	if use doc; then
+		pushd "${S}/Doc" || die
+		emake clean
+		rm -rf *.pdf || die
+		emake
+		popd || die
+		DOCS="${S}/Doc/*.pdf"
+	fi
+	cmake_src_install
+}