tce-load -i compiletc meson vala-dev gmime3-dev webkitgtk4-dev appstream-glib-dev folks-dev gspell-dev libhandy1-dev libpeas-dev desktop-file-utils itstool gsound-dev gobject-introspection-dev gettext

wget https://download.gnome.org/sources/geary/40/geary-40.0.tar.xz

cd geary-40.0

mkdir build
cd build

CC="gcc -flto -mtune=generic -Os -pipe" CXX="g++ -flto -mtune=generic -Os -pipe -fno-exceptions -fno-rtti" meson --prefix=/usr/local --localstatedir=/var --buildtype=plain -Dlibunwind=disabled -Dtnef=disabled -Dprofile=release

ninja [6m 6.06s]
sudo ninja install

$ geary
*[wrn] 22:25:40.0530 geary:application-certificate-manager.vala:74: No GCR slot URIs found, GCR certificate pinning unavailable
*[wrn] 22:25:40.0631 folks:backend-store.vala:435: Error preparing Backend 'telepathy': The name org.freedesktop.Telepathy.AccountManager was not provided by any .service files
*[wrn] 22:25:40.0639 geary:application-client.vala:1001: Error creating controller: The name org.freedesktop.secrets was not provided by any .service files

runtime telepathy-mission-control gnome-keyring