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diff --git a/sci-libs/armadillo/armadillo-10.2.0-r1.ebuild b/sci-libs/armadillo/armadillo-10.2.0-r1.ebuild
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+++ b/sci-libs/armadillo/armadillo-10.2.0-r1.ebuild
@@ -0,0 +1,150 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+CMAKE_IN_SOURCE_BUILD=1
+
+inherit cmake toolchain-funcs multilib
+
+DESCRIPTION="Streamlined C++ linear algebra library"
+HOMEPAGE="http://arma.sourceforge.net/"
+SRC_URI="mirror://sourceforge/arma/${P}.tar.xz"
+
+LICENSE="Apache-2.0"
+SLOT="0/10"
+KEYWORDS="amd64 ~arm ppc64 x86 ~amd64-linux ~x86-linux"
+IUSE="arpack blas doc examples hdf5 lapack mkl superlu test"
+RESTRICT="!test? ( test )"
+REQUIRED_USE="test? ( lapack )"
+
+#	atlas? ( sci-libs/atlas[lapack] )
+
+RDEPEND="
+	dev-libs/boost
+	arpack? ( sci-libs/arpack )
+	blas? ( virtual/blas )
+	lapack? ( virtual/lapack )
+	superlu? ( >=sci-libs/superlu-5.2 )
+"
+
+DEPEND="${RDEPEND}
+	arpack? ( virtual/pkgconfig )
+	blas? ( virtual/pkgconfig )
+	hdf5? ( sci-libs/hdf5 )
+	lapack? ( virtual/pkgconfig )
+	mkl? ( sci-libs/mkl )
+"
+PDEPEND="${RDEPEND}
+	hdf5? ( sci-libs/hdf5 )
+	mkl? ( sci-libs/mkl )
+"
+
+src_prepare() {
+	# avoid the automagic cmake macros...
+	sed -i -e 's/^ *include(ARMA_Find/# No automagic include(ARMA_Find/g' CMakeLists.txt || die
+
+	# ... except for mkl, since without a license it's hard to figure out what to do there
+	if use mkl; then
+		sed -i -e 's/^# No automagic include(ARMA_FindMKL)/include(ARMA_FindMKL)/g' CMakeLists.txt || die
+	fi
+
+	cmake_src_prepare
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DINSTALL_LIB_DIR="${EPREFIX}/usr/$(get_libdir)"
+	)
+	if use arpack; then
+		mycmakeargs+=(
+			-DARPACK_FOUND=ON
+			-DARPACK_LIBRARY="$($(tc-getPKG_CONFIG) --libs arpack)"
+		)
+	else
+		mycmakeargs+=(
+			-DARPACK_FOUND=OFF
+		)
+	fi
+#	if use atlas; then
+#		local c=atlas-cblas l=atlas-clapack
+#		$(tc-getPKG_CONFIG) --exists ${c}-threads && c+=-threads
+#		$(tc-getPKG_CONFIG) --exists ${l}-threads && l+=-threads
+#		mycmakeargs+=(
+#			-DCBLAS_FOUND=ON
+#			-DCBLAS_INCLUDE_DIR="$($(tc-getPKG_CONFIG) --cflags-only-I ${c} | sed 's/-I//')"
+#			-DCBLAS_LIBRARIES="$($(tc-getPKG_CONFIG) --libs ${c})"
+#			-DCLAPACK_FOUND=ON
+#			-DCLAPACK_INCLUDE_DIR="$($(tc-getPKG_CONFIG) --cflags-only-I ${l} | sed 's/-I//')"
+#			-DCLAPACK_LIBRARIES="$($(tc-getPKG_CONFIG) --libs ${l})"
+#		)
+#	fi
+	if use blas; then
+		mycmakeargs+=(
+			-DBLAS_FOUND=ON
+			-DBLAS_LIBRARIES="$($(tc-getPKG_CONFIG) --libs blas)"
+		)
+	else
+		mycmakeargs+=(
+			-DBLAS_FOUND=OFF
+		)
+	fi
+	if use hdf5; then
+		mycmakeargs+=(
+			-DDETECT_HDF5=ON
+			-DHDF5_LIBRARIES="-lhdf5"
+			-DHDF5_INCLUDE_DIRS=/usr/include
+		)
+	else
+		mycmakeargs+=(
+			-DDETECT_HDF5=OFF
+		)
+	fi
+	if use lapack; then
+		mycmakeargs+=(
+			-DLAPACK_FOUND=ON
+			-DLAPACK_LIBRARIES="$($(tc-getPKG_CONFIG) --libs lapack)"
+		)
+	else
+		mycmakeargs+=(
+			-DLAPACK_FOUND=OFF
+		)
+	fi
+	if use superlu; then
+		mycmakeargs+=(
+			-DSuperLU_FOUND=ON
+			-DSuperLU_LIBRARY="$($(tc-getPKG_CONFIG) --libs superlu)"
+			-DSuperLU_INCLUDE_DIR="$($(tc-getPKG_CONFIG) --cflags-only-I superlu | awk '{print $1}' | sed 's/-I//')"
+		)
+	else
+		mycmakeargs+=(
+			-DSuperLU_FOUND=OFF
+		)
+	fi
+
+	cmake_src_configure
+}
+
+src_test() {
+	pushd examples > /dev/null
+	emake \
+		CXX="$(tc-getCXX)" \
+		CXXFLAGS="-I../include ${CXXFLAGS} -DARMA_USE_BLAS -DARMA_USE_LAPACK" \
+		LIB_FLAGS="-L.. -larmadillo $($(tc-getPKG_CONFIG) --libs blas lapack)"
+	LD_LIBRARY_PATH="..:${LD_LIBRARY_PATH}" ./example1 || die
+	emake clean
+	popd > /dev/null
+}
+
+src_install() {
+	cmake_src_install
+
+	dodoc README.md
+	use doc && dodoc *pdf *html
+
+	if use examples; then
+		docinto examples
+		dodoc -r examples/*
+		docompress -x /usr/share/doc/${PF}/examples
+	fi
+}