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diff --git a/sci-mathematics/singular/singular-4.2.0_p1.ebuild b/sci-mathematics/singular/singular-4.2.0_p1.ebuild
new file mode 100644
index 000000000000..b015ba5fee61
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+++ b/sci-mathematics/singular/singular-4.2.0_p1.ebuild
@@ -0,0 +1,104 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit autotools elisp-common
+
+MY_PN=Singular
+MY_PV=$(ver_rs 3 '')
+# Consistency is different...
+MY_DIR2=$(ver_cut 1-3 ${PV})
+MY_DIR=$(ver_rs 1- '-' ${MY_DIR2})
+
+DESCRIPTION="Computer algebra system for polynomial computations"
+HOMEPAGE="https://www.singular.uni-kl.de/ https://github.com/Singular/Sources"
+SRC_URI="ftp://jim.mathematik.uni-kl.de/pub/Math/${MY_PN}/SOURCES/${MY_DIR}/${PN}-${MY_PV}.tar.gz"
+
+LICENSE="BSD GPL-2 GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~ppc ~x86 ~x86-linux"
+IUSE="emacs examples +readline static-libs"
+
+RDEPEND="dev-libs/gmp:0
+	dev-libs/ntl:=
+	emacs? ( >=app-editors/emacs-23.1:* )
+	sci-mathematics/flint
+	sci-libs/cddlib
+	dev-lang/perl
+	readline? ( sys-libs/readline )"
+
+DEPEND="${RDEPEND}"
+
+SITEFILE=60${PN}-gentoo.el
+
+S="${WORKDIR}/${PN}-${MY_DIR2}"
+
+PATCHES=(
+	"${FILESDIR}/${PN}-4.0.3-gfan_linking.patch"
+	"${FILESDIR}/${PN}-4.1.3-doc_install.patch"
+	"${FILESDIR}/${PN}-4.2.0-no-static.patch"
+)
+
+src_prepare() {
+	default
+
+	eautoreconf
+}
+
+src_configure() {
+	econf --with-gmp \
+		--with-ntl="${EPREFIX}"/usr \
+		--with-flint \
+		--enable-gfanlib \
+		--disable-debug \
+		--disable-doc \
+		--enable-factory \
+		--enable-libfac \
+		--enable-IntegerProgramming \
+		--disable-polymake \
+		$(use_enable static-libs static) \
+		$(use_enable emacs) \
+		$(use_with readline)
+}
+
+src_compile() {
+	default
+
+	if use emacs; then
+		pushd "${S}"/emacs
+		elisp-compile *.el || die "elisp-compile failed"
+		popd
+	fi
+}
+
+src_install() {
+	# Do not compress singular's info file (singular.hlp)
+	# some consumer of that file do not know how to deal with compression
+	docompress -x /usr/share/info
+
+	default
+
+	dosym Singular /usr/bin/"${PN}"
+
+	# purge .la file
+	find "${ED}" -name '*.la' -delete || die
+}
+
+src_test() {
+	# SINGULAR_PROCS_DIR need to be set to "" otherwise plugins from
+	# an already installed version of singular may be used and cause segfault
+	# See https://github.com/Singular/Sources/issues/980
+	SINGULAR_PROCS_DIR="" emake check
+}
+
+pkg_postinst() {
+	einfo "Additional functionality can be enabled by installing"
+	einfo "sci-mathematics/4ti2"
+
+	use emacs && elisp-site-regen
+}
+
+pkg_postrm() {
+	use emacs && elisp-site-regen
+}