tce-load -i compiletc libxfce4ui-dev libxfce4windowing-dev shared-mime-info desktop-file-utils gtk-layer-shell-dev

wget https://archive.xfce.org/src/xfce/xfce4-session/4.20/xfce4-session-4.20.3.tar.bz2

cd xfce4-session-4.20.3

CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --localstatedir=/var --disable-static --disable-legacy-sm

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make [0m 30.53s]
sudo make install

Build Configuration:

 * Debugging support:              minimum
 * X11 Support:                    yes
   * Legacy session management:    no
 * Wayland Support:                yes
   * Gtk Layer Shell support:      yes
 * Polkit/PolicyKit support:       no
 * Backend:                        linux