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diff --git a/sci-libs/flann/flann-1.9.1-r6.ebuild b/sci-libs/flann/flann-1.9.1-r6.ebuild
new file mode 100644
index 000000000000..8f253ff0802e
--- /dev/null
+++ b/sci-libs/flann/flann-1.9.1-r6.ebuild
@@ -0,0 +1,94 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit cmake cuda flag-o-matic toolchain-funcs
+
+DESCRIPTION="Fast approximate nearest neighbor searches in high dimensional spaces"
+HOMEPAGE="https://github.com/mariusmuja/flann"
+SRC_URI="https://github.com/mariusmuja/${PN}/archive/${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="amd64 ~arm arm64 ~ppc ~x86 ~amd64-linux ~x86-linux"
+IUSE="cuda doc examples mpi octave openmp"
+
+BDEPEND="
+	app-arch/unzip
+	doc? ( dev-tex/latex2html )
+	mpi? ( app-admin/chrpath )
+"
+DEPEND="
+	app-arch/lz4:=
+	cuda? ( >=dev-util/nvidia-cuda-toolkit-5.5 )
+	mpi? (
+		dev-libs/boost:=[mpi]
+		sci-libs/hdf5:=[mpi]
+	)
+	!mpi? ( !sci-libs/hdf5[mpi] )
+	octave? ( >=sci-mathematics/octave-3.6.4-r1:= )
+"
+RDEPEND="${DEPEND}"
+# TODO:
+# readd dependencies for test suite,
+# requires multiple ruby dependencies
+
+PATCHES=(
+	"${FILESDIR}"/${P}-cmake-3.11{,-1}.patch # bug 678030
+	"${FILESDIR}"/${P}-cuda-9.patch
+	"${FILESDIR}"/${P}-system-lz4.patch # bug 681898
+	"${FILESDIR}"/${P}-system-lz4-pkgconfig.patch # bug 827263
+	"${FILESDIR}"/${P}-build-oct-rather-than-mex-files-for-octave.patch # bug 830424
+)
+
+pkg_pretend() {
+	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
+}
+
+pkg_setup() {
+	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
+}
+
+src_prepare() {
+	# bug #302621
+	use mpi && export CXX=mpicxx
+
+	use cuda && cuda_src_prepare
+
+	cmake_src_prepare
+}
+
+src_configure() {
+	append-cxxflags -std=c++11
+
+	# python bindings are split off into dev-python/pyflann
+	local mycmakeargs=(
+		-DBUILD_C_BINDINGS=ON
+		-DBUILD_PYTHON_BINDINGS=OFF
+		-DPYTHON_EXECUTABLE=
+		-DBUILD_CUDA_LIB=$(usex cuda)
+		-DBUILD_EXAMPLES=$(usex examples)
+		-DBUILD_DOC=$(usex doc)
+		-DBUILD_TESTS=OFF
+		-DBUILD_MATLAB_BINDINGS=$(usex octave)
+		-DUSE_MPI=$(usex mpi)
+		-DUSE_OPENMP=$(usex openmp)
+	)
+	use cuda && mycmakeargs+=(
+		-DCUDA_NVCC_FLAGS="${NVCCFLAGS} --linker-options \"-arsch\""
+	)
+	use doc && mycmakeargs+=( -DDOCDIR=share/doc/${PF} )
+
+	cmake_src_configure
+}
+
+src_install() {
+	cmake_src_install
+	find "${D}" -name 'lib*.a' -delete || die
+
+	# bug 795828; mpicc volunterely adds some runpaths
+	if use mpi; then
+		chrpath -d "${ED}"/usr/bin/flann_mpi_{client,server} || die
+	fi
+}