Install gtk+-2-devs and it's dependencies, Xorg-dev, etc.

export PKG_CONFIG_PATH=/usr/lib/pkgconfig:/usr/local/lib/pkgconfig
export CFLAGS="-march=i486 -mtune=i686 -Os -pipe"

tar xjvf rox-filer-2.8.tar.bz2

cd rox-filer-2.8/ROX-Filer

./AppRun --compile

#create wrapper, menu, trim, and copy contents into extension.