Install this version:
emerge -a =kde-apps/kmouth-26.04.0
If this version is masked, you can unmask it using the autounmask tool or standard emerge options:
autounmask =kde-apps/kmouth-26.04.0
Or alternatively:
emerge --autounmask-write -a =kde-apps/kmouth-26.04.0
# Copyright 1999-2026 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
EAPI=8
ECM_HANDBOOK="optional"
KFMIN=6.22.0
QTMIN=6.10.1
inherit ecm gear.kde.org xdg
DESCRIPTION="Text-to-speech synthesizer front end"
HOMEPAGE="https://apps.kde.org/kmouth/"
LICENSE="GPL-2" # TODO: CHECK
SLOT="6"
KEYWORDS="~amd64 ~arm64 ~loong ~riscv ~x86"
IUSE=""
DEPEND="
>=dev-qt/qtbase-${QTMIN}:6[gui,widgets,xml]
>=dev-qt/qtspeech-${QTMIN}:6
>=kde-frameworks/kcompletion-${KFMIN}:6
>=kde-frameworks/kconfig-${KFMIN}:6
>=kde-frameworks/kconfigwidgets-${KFMIN}:6
>=kde-frameworks/kcoreaddons-${KFMIN}:6
>=kde-frameworks/kcrash-${KFMIN}:6
>=kde-frameworks/ki18n-${KFMIN}:6
>=kde-frameworks/kio-${KFMIN}:6
>=kde-frameworks/kwidgetsaddons-${KFMIN}:6
>=kde-frameworks/kxmlgui-${KFMIN}:6
"
RDEPEND="${DEPEND}"
>=dev-qt/qtbase-6.10.1:6[gui,widgets,xml] >=dev-qt/qtspeech-:6 >=kde-frameworks/kcompletion-6.22.0:6 >=kde-frameworks/kconfig-:6 >=kde-frameworks/kconfigwidgets-:6 >=kde-frameworks/kcoreaddons-:6 >=kde-frameworks/kcrash-:6 >=kde-frameworks/ki18n-:6 >=kde-frameworks/kio-:6 >=kde-frameworks/kwidgetsaddons-:6 >=kde-frameworks/kxmlgui-:6
>=dev-qt/qtbase-6.10.1:6[gui,widgets,xml] >=dev-qt/qtspeech-:6 >=kde-frameworks/kcompletion-6.22.0:6 >=kde-frameworks/kconfig-:6 >=kde-frameworks/kconfigwidgets-:6 >=kde-frameworks/kcoreaddons-:6 >=kde-frameworks/kcrash-:6 >=kde-frameworks/ki18n-:6 >=kde-frameworks/kio-:6 >=kde-frameworks/kwidgetsaddons-:6 >=kde-frameworks/kxmlgui-:6