Add dev-qt from an older version of the gentoo repo

Qt5 has been removed, we restore it since we still use it.

dev-qt/qtchooser/qtchooser-66-r2.ebuild

@@ -0,0 +1,73 @@
+# Copyright 1999-2024 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit qmake-utils toolchain-funcs
+
+DESCRIPTION="Tool to quickly switch between multiple Qt installations"
+HOMEPAGE="https://code.qt.io/cgit/qtsdk/qtchooser.git/"
+
+if [[ ${PV} == *9999* ]]; then
+	EGIT_REPO_URI="https://code.qt.io/qtsdk/qtchooser.git"
+	inherit git-r3
+else
+	SRC_URI="https://download.qt.io/official_releases/${PN}/${P}.tar.xz"
+	KEYWORDS="amd64 arm arm64 ~hppa ~loong ppc ppc64 ~riscv x86"
+fi
+
+LICENSE="|| ( LGPL-2.1 GPL-3 )"
+SLOT="0"
+IUSE="test"
+RESTRICT="!test? ( test )"
+
+DEPEND="test? (
+		dev-qt/qtcore:5
+		dev-qt/qttest:5
+	)"
+RDEPEND="!<dev-qt/qtcore-5.15.3:5"
+
+PATCHES=( "${FILESDIR}/${PN}-66-qt-5.15.3-compat.patch" )
+
+qtchooser_make() {
+	emake \
+		CXX="$(tc-getCXX)" \
+		LFLAGS="${LDFLAGS}" \
+		prefix="${EPREFIX}/usr" \
+		"$@"
+}
+
+src_compile() {
+	qtchooser_make
+}
+
+src_test() {
+	pushd tests/auto >/dev/null || die
+	eqmake5
+	popd >/dev/null || die
+
+	qtchooser_make check
+}
+
+src_install() {
+	qtchooser_make INSTALL_ROOT="${D}" install
+
+	# install configuration file
+	cat > "${T}/qt5-${CHOST}.conf" <<-_EOF_ || die
+		$(qt5_get_bindir)
+		$(qt5_get_libdir)
+	_EOF_
+
+	(
+		insinto /etc/xdg/qtchooser
+		doins "${T}/qt5-${CHOST}.conf"
+	)
+
+	# convenience symlinks
+	dosym qt5-"${CHOST}".conf /etc/xdg/qtchooser/5.conf
+	dosym qt5-"${CHOST}".conf /etc/xdg/qtchooser/qt5.conf
+	dosym qt5.conf /etc/xdg/qtchooser/default.conf
+
+	# TODO: bash and zsh completion
+	# newbashcomp scripts/${PN}.bash ${PN}
+}