Basic instructions for compiling:

  cd oxygen-transparent
  mkdir build
  cd build
  cmake -DCMAKE_INSTALL_PREFIX=`kde4-config --prefix`
  make -j2
  sudo make install

You the need to select the style and window decoration named "Oxygen Transparent" from corresponding systemsettings pages.
You can also run oxygen-transparent-settings from terminal or using krunner, to get all oxygen settings at once, including the background opacity setting.
