tce-load -i compiletc meson dbus-dev gnome-desktop-dev json-glib-dev upower-dev Xorg-7.7-3d-dev xmlto gettext

wget https://download.gnome.org/sources/gnome-session/45/gnome-session-45.0.tar.xz

cd gnome-session-45.0

sed 's@/bin/sh@/bin/sh -l@' -i gnome-session/gnome-session.in

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 --libexecdir=/usr/local/lib/gnome-session --localstatedir=/var --buildtype=plain -Dsystemd_journal=false -Dman=false -Ddocbook=false -Dsystemduserunitdir=/tmp

ninja [0m 14.28s]
sudo ninja install

sudo rm -v /usr/local/share/xsessions/gnome.desktop
sudo rm -v /usr/local/share/wayland-sessions/gnome.desktop

sudo rm -rv /tmp/*.d
sudo rm -rv /tmp/*.target
sudo rm -rv /tmp/*.service

The startup sequence of gnome-wayland needs to create a dbus session. On SysV, this has to be added to the shipped gnome-wayland.desktop file, which is written for systemd. As the root user:

sudo sed -e 's@^Exec=@&/usr/local/bin/dbus-run-session @' -i /usr/local/share/wayland-sessions/gnome-wayland.desktop

 
To start GNOME using xinit-1.4.2, run the following commands:

cat > ~/.xinitrc << "EOF"
dbus-run-session gnome-session
EOF

startx

Alternatively, to start GNOME with Wayland support, run the following command:

XDG_SESSION_TYPE=wayland dbus-run-session gnome-session

                gnome-session 45.0
                ====================

        prefix:                   /usr/local
        exec_prefix:              /usr/local/lib/gnome-session
        libdir:                   /usr/local/lib
        bindir:                   /usr/local/bin
        sbindir:                  /usr/local/sbin
        sysconfdir:               /usr/local/etc
        localstatedir:            /var
        datadir:                  /usr/local/share
        source code location:     /usr/src/gnome-session-45.0
        compiler:                 gcc
        cflags:                   
        Debug mode:               false
        Use *_DISABLE_DEPRECATED: false

        Session tracking:         systemd 
        Build Docbook:            false
        Build manpages:           false
Build targets in project: 145
NOTICE: Future-deprecated features used:
 * 0.56.0: {'meson.source_root'}

gnome-session 45.0

  User defined options
    buildtype         : plain
    libexecdir        : /usr/local/lib/gnome-session
    localstatedir     : /var
    prefix            : /usr/local
    docbook           : false
    man               : false
    systemd_journal   : false
    systemduserunitdir: /tmp