See discussion at https://forums.gentoo.org/viewtopic-t-1171513.html. Thanks.
I took the ebuild of version 1.2.0, saved it as performous-1.3.1.ebuild and found that this version of performous checks for nlohmann-json, so I put that into RDEPEND. But I'm stuck because it also checks for compact_enc_det (can be found here: https://github.com/performous/compact_enc_det ). But at least on my machines (amd64 & arm64) the ebuild fails with: -- Checking for module 'CED' -- Package 'CED' not found -- ced build from source because not found on system -- Fetching and making available ced-src... [1/9] Creating directories for 'ced-src-populate' [1/9] Performing download step (git clone) for 'ced-src-populate' Cloning into 'ced-src-src'... fatal: unable to access 'https://github.com/performous/compact_enc_det.git/': Could not resolve host: github.com Cloning into 'ced-src-src'... fatal: unable to access 'https://github.com/performous/compact_enc_det.git/': Could not resolve host: github.com Cloning into 'ced-src-src'... fatal: unable to access 'https://github.com/performous/compact_enc_det.git/': Could not resolve host: github.com Had to git clone more than once: 3 times. CMake Error at /var/tmp/portage/games-arcade/performous-1.3.1/work/performous-1.3.1_build/_deps/ced-src-subbuild/ced-src-populate-prefix/tmp/ced-src-populate-gitclone.cmake:50 (message): Failed to clone repository: 'https://github.com/performous/compact_enc_det.git' I tried to make a working ebuild for https://github.com/performous/compact_enc_det but I failed. Maybe it's easier to fix this within the ebuild for performous? So, this is what I have so far. Not much but maybe someone can make use of it as a starting point. # Copyright 1999-2024 Gentoo Authors # Distributed under the terms of the GNU General Public License v2 EAPI=8 inherit cmake # CED is only used in 1.2.0 and can be dropped on bump, no LICENSE # changes needed given Apache-2.0 is also used by installed fonts HASH_CED=9ca1351fe0b1e85992a407b0fc54a63e9b3adc6e DESCRIPTION="SingStar GPL clone" HOMEPAGE="https://performous.org/" SRC_URI=" https://github.com/performous/performous/archive/refs/tags/${PV}.tar.gz -> ${P}.tar.gz https://github.com/performous/compact_enc_det/archive/${HASH_CED}.tar.gz -> ${PN}-ced-${HASH_CED}.tar.gz songs? ( https://downloads.sourceforge.net/performous/ultrastar-songs-jc-1.zip https://downloads.sourceforge.net/performous/ultrastar-songs-libre-3.zip https://downloads.sourceforge.net/performous/ultrastar-songs-restricted-3.zip https://downloads.sourceforge.net/performous/ultrastar-songs-shearer-1.zip )" LICENSE=" GPL-2 Apache-2.0 OFL-1.1 songs? ( CC-BY-NC-SA-2.5 CC-BY-NC-ND-2.5 )" SLOT="0" KEYWORDS="~amd64 ~arm64 ~x86" IUSE="midi songs webcam" RDEPEND=" dev-cpp/libxmlpp:5.0 dev-cpp/nlohmann_json dev-libs/boost:=[nls] dev-libs/glib:2 dev-libs/icu:= gnome-base/librsvg:2 media-libs/aubio:=[fftw] media-libs/fontconfig:1.0 media-libs/glm media-libs/libepoxy media-libs/libjpeg-turbo:= media-libs/libpng:= media-libs/libsdl2[joystick,opengl,video] media-libs/portaudio media-video/ffmpeg:= virtual/libintl x11-libs/cairo x11-libs/pango midi? ( media-libs/portmidi ) webcam? ( media-libs/opencv:= )" DEPEND="${RDEPEND}" BDEPEND=" sys-apps/help2man sys-devel/gettext songs? ( app-arch/unzip )" PATCHES=( ) src_prepare() { cmake_src_prepare if [[ -v LINGUAS ]]; then local po for po in lang/*.po; do : "${po#*/}" has "${_%.*}" ${LINGUAS} || rm "${po}" || die done fi # glibmm is only needed if libxmlpp:2.6, but :5.0 is used if available sed -i '/Glibmm/d' cmake/Modules/FindLibXML++.cmake || die } src_configure() { local mycmakeargs=( -DENABLE_MIDI=$(usex midi) -DENABLE_WEBCAM=$(usex webcam) -DFETCHCONTENT_SOURCE_DIR_CED-SOURCES="${WORKDIR}"/compact_enc_det-${HASH_CED} -DSHARE_INSTALL="${EPREFIX}"/usr/share/${PN} # webserver needs unpackaged cpprestsdk which is not recommended for # use by its upstream (dead), may consider adding only if requested -DENABLE_WEBSERVER=no ) cmake_src_configure } src_install() { local DOCS=( README.md docs/{Authors,instruments}.txt ) cmake_src_install insinto /usr/share/${PN} use songs && doins -r "${WORKDIR}"/songs gzip -d "${ED}"/usr/share/man/man6/${PN}.6.gz || die }