1- mkdir ~/Xorg-7.3
2- Download all slackware-current X serie packages
   http://download.zenwalk.org/i486/testing/
3- init 3
4- removepkg (or pkgtool ;) )
     dejavu-ttf
     freetype
     fontconfig
     libdrm
     mesa
     twm
     xaw3d
     xorg
     xorg-fonts-scalable
     xscreensaver
     xterm
5- cd ~/Xorg-7.3
6- upgradepkg --install-new *.tgz
7- Drink a little coffee ;)
8- vim (or mcedit) /etc/X11/xorg.conf
   change 
     ModulePath   "/usr/lib/X11/modules"
   to
     ModulePath "/usr/lib/xorg/modules"
   save your change and quit.
9- ldconfig -v
10- startx .....