diff --git a/sci-electronics/ngspice/Manifest b/sci-electronics/ngspice/Manifest
index e112eb71c247..7307c66c247a 100644
--- a/sci-electronics/ngspice/Manifest
+++ b/sci-electronics/ngspice/Manifest
@@ -1,4 +1,2 @@
-DIST ngspice-40-manual.pdf 2462604 BLAKE2B a0d680cd76f8acb1be18e94953d70784aaf79e1bcc4bc3995a1221d81e27c13e577d182e7cbacb8430a068db7d86681f22ec4f3537b5704faacb8e982588617f SHA512 1a5c7828aa9a4554052fb01145641415d8a4cbd50db9885d5d937e1b6f50c7c541dfeeabf2efd6ea862036b4d74ce8265bdac1cfad0fc635f28651a0d397bfc5
-DIST ngspice-40.tar.gz 9431981 BLAKE2B e45d5d7a9e8d9d3fdae4eb076090a588680055a74cc24ba9ca3d93a7c42b95ee29073101d5791f8069cb27b3049aa1a451476f1df6460477fb156336602678fd SHA512 dab422cc8677e6f4bb92e06be0ce695a53d3e9abbe533c7bb91540d55d2a13514b0b166c8ccafcc17699799a846a35e260dddc400664c6e1137e1b18504e9954
 DIST ngspice-43-manual.pdf 2559027 BLAKE2B 71c86d4325025900db0d7ae961134111f1004490f827be64322cf1109e3781630f4ad7f70006a5e086914b6ec1b8a82bfc013219237d52838cb9dcbd4ece52bb SHA512 01bd68983c10ca8ef2a399354290032a0e9a9881159a3781459c576e662efa91af403ef191e846694ef418a8aec3e867d8e916d8a41a6d616d3169daf22be444
 DIST ngspice-43.tar.gz 10279606 BLAKE2B a866866dfe6dec238241406fe323baa22fd4145e7bda9e234cee507690fe224938663423ffc3fc37bf86093a982151ad96a5ba53fe292161f901297eef1cf892 SHA512 ad938e6ea8f9874c04d1033599bf39d3728e763fbd42ba77bd036b6c00271600695b3656f3f34547c39153382f55e7d7d5d6cb732f272d149cdbe21988c0d636
diff --git a/sci-electronics/ngspice/ngspice-40.ebuild b/sci-electronics/ngspice/ngspice-40.ebuild
deleted file mode 100644
index c06bd1110fc8..000000000000
--- a/sci-electronics/ngspice/ngspice-40.ebuild
+++ /dev/null
@@ -1,215 +0,0 @@
-# Copyright 1999-2024 Gentoo Authors
-# Distributed under the terms of the GNU General Public License v2
-
-EAPI=8
-
-inherit autotools flag-o-matic multibuild toolchain-funcs virtualx
-
-DESCRIPTION="The Next Generation Spice (Electronic Circuit Simulator)"
-HOMEPAGE="http://ngspice.sourceforge.net"
-SRC_URI="
-	https://downloads.sourceforge.net/ngspice/${P}.tar.gz
-	doc? ( https://downloads.sourceforge.net/ngspice/${P}-manual.pdf )
-"
-
-LICENSE="BSD GPL-2 MPL-2.0"
-SLOT="0"
-IUSE="X debug deprecated doc examples fftw openmp +readline +shared tcl"
-KEYWORDS="amd64 ~arm64 ~ppc ~riscv ~sparc ~x86 ~x64-macos"
-RESTRICT="!test? ( test )"
-
-DEPEND="
-	sys-libs/ncurses:=
-	X? (
-		x11-libs/libXaw
-		x11-libs/libXt
-		x11-libs/libX11
-	)
-	fftw? ( sci-libs/fftw:3.0= )
-	readline? ( sys-libs/readline:= )
-	tcl? (
-		dev-lang/tcl:=
-		dev-tcltk/blt
-	)
-"
-RDEPEND="${DEPEND}"
-
-DOCS=(
-	ANALYSES
-	AUTHORS
-	BUGS
-	ChangeLog
-	DEVICES
-	FAQ
-	NEWS
-	README
-	README.vdmos
-	Stuarts_Poly_Notes
-)
-
-pkg_pretend() {
-	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
-}
-
-pkg_setup() {
-	[[ ${MERGE_TYPE} != binary ]] && use openmp && tc-check-openmp
-
-	MULTIBUILD_VARIANTS=( "binaries" )
-	use shared && MULTIBUILD_VARIANTS+=( "shared" )
-	use tcl && MULTIBUILD_VARIANTS+=( "tcl" )
-}
-
-src_prepare() {
-	default
-
-	if use tcl; then
-		if use examples; then
-			find examples/tclspice -type f -iname \*tcl -or -iname \*.sh |
-			while read s
-			do
-				sed -i -e 's@../../../src/.libs/libspice.so@libspice.so@g' \
-					-e 's@package require BLT@package require Tk\npackage require BLT@g' \
-					-e "s@spice::codemodel \(.*\)/\(.*\).cm@spice::codemodel /usr/$(get_libdir)/ngspice/\2.cm@g" \
-					"${s}" || die "sed failed"
-			done
-		fi
-	fi
-
-	eautoreconf
-	multibuild_copy_sources
-}
-
-src_configure() {
-	# -Werror=lto-type-mismatch
-	# https://bugs.gentoo.org/862513
-	# https://sourceforge.net/p/ngspice/bugs/665/
-	filter-lto
-
-	multibuild_foreach_variant ngspice_configure
-}
-
-ngspice_configure() {
-	local myeconfargs
-
-	pushd "${BUILD_DIR}" &>/dev/null || die
-
-	if use debug; then
-		myeconfargs=(
-			--enable-debug
-			--enable-ftedebug
-			--enable-cpdebug
-			--enable-sensdebug
-			--enable-asdebug
-			--enable-stepdebug
-			--enable-pzdebug
-		)
-	else
-		myeconfargs=(
-			--disable-debug
-			--disable-ftedebug
-			--disable-cpdebug
-			--disable-sensdebug
-			--disable-asdebug
-			--disable-stepdebug
-			--disable-pzdebug
-		)
-	fi
-
-	# As of March 2021, these do not compile
-	myeconfargs+=(
-		--disable-blktmsdebug
-		--disable-smltmsdebug
-	)
-
-	myeconfargs+=(
-		--enable-xspice
-		--enable-cider
-		--disable-rpath
-		$(use_enable openmp)
-		$(use_with fftw fftw3)
-		$(use_with readline)
-	)
-
-	if [[ "${MULTIBUILD_VARIANT}" == "shared" ]]; then
-		myeconfargs+=( --with-ngshared )
-	elif [[ "${MULTIBUILD_VARIANT}" == "tcl" ]]; then
-		myeconfargs+=( --with-tcl="${EPREFIX}/usr/$(get_libdir)" )
-	else
-		myeconfargs+=(
-			$(use_enable deprecated oldapps)
-			$(use_with X x)
-		)
-	fi
-
-	econf "${myeconfargs[@]}"
-
-	popd &>/dev/null || die
-}
-
-src_compile() {
-	multibuild_foreach_variant ngspice_compile
-}
-
-ngspice_compile() {
-	pushd "${BUILD_DIR}" &>/dev/null || die
-	default
-	popd &>/dev/null || die
-}
-
-src_test() {
-	if ! use debug; then
-		# tests can be only executed for the binaries variant
-		pushd "${WORKDIR}/${P}-binaries" &>/dev/null || die
-		echo "set ngbehavior=mc" > "${HOME}"/.spiceinit || die "Failed to configure ${PN} for running the test suite"
-		virtx default
-		popd &>/dev/null || die
-	else
-		# https://sourceforge.net/p/ngspice/bugs/353/
-		ewarn
-		ewarn "Skipping tests because they are known to fail in debug mode"
-		ewarn
-	fi
-}
-
-src_install() {
-	multibuild_foreach_variant ngspice_install
-
-	# merge the installations of all variants
-	local v
-	for v in "${MULTIBUILD_VARIANTS[@]}" ; do
-		cp -a "${ED}/tmp/${v}"/* "${ED}" || die "Failed to combine multibuild installations"
-	done
-	rm -rf "${ED}/tmp" || die
-
-	use tcl && DOCS+=( README.tcl )
-	use shared && DOCS+=( README.shared-xspice )
-	use doc && DOCS+=( "${DISTDIR}"/${P}-manual.pdf )
-
-	default
-
-	if use examples; then
-		if ! use tcl; then
-			rm -rf examples/tclspice || die
-		fi
-
-		insinto /usr/share/${PN}
-		doins -r examples
-	fi
-}
-
-ngspice_install() {
-	pushd "${BUILD_DIR}" &>/dev/null || die
-
-	emake DESTDIR="${ED}/tmp/${MULTIBUILD_VARIANT}" install
-
-	# Strip shared-library and Tcl-module builds to the bare minimum;
-	# all the support files will have been handled by the 'binaries' build.
-	if [[ "${MULTIBUILD_VARIANT}" != "binaries" ]]; then
-		rm -rf "${ED}/tmp/${MULTIBUILD_VARIANT}"/usr/bin{,.debug} || die
-		rm -rf "${ED}/tmp/${MULTIBUILD_VARIANT}"/usr/share || die
-		rm -rf "${ED}/tmp/${MULTIBUILD_VARIANT}"/usr/$(get_libdir)/*.la || die
-		rm -rf "${ED}/tmp/${MULTIBUILD_VARIANT}"/usr/$(get_libdir)/ngspice/*.cm{,.debug} || die
-	fi
-
-	popd &>/dev/null || die
-}