tce-load -i compiletc libwnck-dev libxfce4ui -dev startup-notification-dev libXpresent-dev

wget https://archive.xfce.org/src/xfce/xfwm4/4.20/xfwm4-4.20.0.tar.bz2

cd xfwm4-4.20.0

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

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

make [0m 50.63s]
sudo make install

Build Configuration for xfwm4 version 4.20.0 revision unknown:
  Startup notification support: yes
  XSync support:                yes
  Render support:               yes
  Xrandr support:               yes
  Xpresent support:             yes
  Xi2 support:                  no
  Embedded compositor:          yes
  Epoxy support:                yes
  Position window:              no