tce-load -i compiletc intltool libwnck-dev

wget https://archive.xfce.org/src/xfce/xfwm4/4.18/xfwm4-4.18.0.tar.bz2

cd xfwm4-4.18.0

CC="gcc -flto -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --disable-static --localstatedir=/var --disable-debug

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

make [0m 37.45s]
sudo make install

Build Configuration for xfwm4 version 4.18.0 revision 7e7473c5b:
  Startup notification support: yes
  XSync support:                yes
  Render support:               yes
  Xrandr support:               yes
  Xpresent support:             no
  Xi2 support:                  no
  Embedded compositor:          yes
  Epoxy support:                yes
  Position window:              no