From the link posted by Xushi:
Quote:
Please, note that transparency only works with an X server that supports the Composite extension, like XOrg >= 6.8.0 and the composite extension has been enabled in the configuration file and the window manager supports it (e.g. xfwm4 has to be compiled with --enable-compositor).
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From xfce.SlackBuild:
Quote:
# From the COMPOSITOR file in xfwm4:
#
# xfwm4 now features a compositing manager. This code is new and has received only
# a moderate amount of testing, so it's disabled by default.
#
# So, if you want to stay safe, keep the compositor disabled...
#
# If you still want to try the compositor extensions with xfwm4, here follows how
# to enable the compositing manager in xfwm4.
#
# 1) Enabling the compositor manager in xfwm4
# -------------------------------------------
#
# To enable the compositing manager in xfwm4, add --enable-compositor when running
# the configure script.
#
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So a recompile of xfce is in order before anything else. This is actually pretty easy. Look to your favorite Slackware mirror. I just download the entire xap/xfce directory and edit xfce.SlackBuild. After that, just run xfce.SlackBuild and look in /tmp for the new package. Use upgradepkg to install it.