diff --git a/sci-libs/jdqz/Manifest b/sci-libs/jdqz/Manifest
new file mode 100644
index 0000000000..b59a985d89
--- /dev/null
+++ b/sci-libs/jdqz/Manifest
@@ -0,0 +1 @@
+DIST jdqz-1997.11.07.tar.gz 15428 BLAKE2B 7d6fcc29a3ed8d055a49b580823e27286135bd1df59382240b742eb60be07953b9a7c64f11091eea2ad5f04a7ba79a726a7f12897798dd5136c6331aa81bac4d SHA512 9eaf1213c46090fcd133b33bc8e859d32078ade86c9a20eda1c0fb21547aa2f851014cff44d8ada0406cd771892b661e4c03ff7eb4cd3a492997f32f7eb328c3
diff --git a/sci-libs/jdqz/jdqz-1997.11.07.ebuild b/sci-libs/jdqz/jdqz-1997.11.07.ebuild
new file mode 100644
index 0000000000..b2530c7f78
--- /dev/null
+++ b/sci-libs/jdqz/jdqz-1997.11.07.ebuild
@@ -0,0 +1,72 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="7"
+
+inherit flag-o-matic fortran-2
+
+DESCRIPTION="Jacobi-Davidson type method for the generalized standard eigenvalue problem."
+HOMEPAGE="https://www.win.tue.nl/casa/research/scientificcomputing/topics/jd/software.html"
+SRC_URI="https://www.win.tue.nl/casa/research/scientificcomputing/topics/jd/${PN}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64"
+
+IUSE="doc"
+
+# /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: ../jdlib/libjdqz.so: undefined reference to `zgegs_'
+#/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: ../jdlib/libjdqz.so: undefined reference to `zgegv_'
+RESTRICT="test"
+
+DEPEND="
+	virtual/blas
+	virtual/lapack
+"
+RDEPEND="${DEPEND}"
+BDEPEND="doc? ( dev-texlive/texlive-latex )"
+
+S="${WORKDIR}/${PN}"
+
+src_prepare() {
+	libs="$($(tc-getPKG_CONFIG) --libs blas)"
+	libs+=" $($(tc-getPKG_CONFIG) --libs lapack)"
+
+	export libs
+
+	sed -i 's/f77/${F77}/g' jdtest/Makefile || die
+	sed -i '/FFLAGS/d' jdtest/Makefile || die
+	sed -i 's/-u -O/-u ${FFLAGS}/g' jdtest/Makefile || die
+
+	sed -i "s/-llapack -lblas/${libs}/" jdtest/Makefile || die
+
+	default
+}
+
+src_compile() {
+	if use doc; then
+		pdflatex manual.tex || die
+	fi
+
+	cd "jdlib" || die
+
+	echo '#!/bin/sh' > make.sh || die
+	echo "${FC}" *.f "${FFLAGS} -shared -fPIC -Wl,-soname,libjdqz.so.0 -lm ${libs} ${LDFLAGS} -o libjdqz.so.0" >> make.sh || die
+	chmod +x make.sh || die
+
+	./make.sh || die
+	ln -s libjdqz.so.0 libjdqz.so || die
+}
+
+src_test() {
+	cd jdtest || die
+	emake
+	LD_LIBRARY_PATH="./jdlib" ./jdtest/example || die
+}
+
+src_install() {
+	dolib.so jdlib/libjdqz.so
+	dolib.so jdlib/libjdqz.so.0
+
+	use doc && dodoc manual.pdf
+}
diff --git a/sci-libs/jdqz/metadata.xml b/sci-libs/jdqz/metadata.xml
new file mode 100644
index 0000000000..a6bd2638e6
--- /dev/null
+++ b/sci-libs/jdqz/metadata.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="person">
+		<email>lssndrbarbieri@gmail.com</email>
+		<name>Alessandro Barbieri</name>
+	</maintainer>
+	<longdescription>Jacobi-Davidson type method for the generalized standard eigenvalue problem. Choice of standard or harmonic Rayleigh-Ritz for the extraction. Choice of GMRES or BiCGstab(l) for solving the correction equation.</longdescription>
+</pkgmetadata>