Multiload-ng is a near-complete rewrite of the old GNOME multiload
applet that aims to support *every* existing panel.

Note: upstream defaults are
 - build against GTK+3
 - build the standalone application
 - do not build the lxpanel plugin
 - do not build the mate panel plugin
 - build the generic system tray plugin
 - build the xfce4 panel plugin

any of these may be overridden by passing its corresponding parameter to
the script, i. e.
 - GTK=2
 - STANDALONE=no
 - LXPANEL=yes
 - MATE=yes
 - SYSTRAY=no
 - XFCE4=no

for example
   GTK=2 LXPANEL=yes ./multiload-ng.SlackBuild