Arch Linux package that modifies xfce4-panel to allow build-time user-defined tray spacing
git clone https://github.com/sartbimpson/xkcd-panel
cd xkcd-panel
chmod +x updatepkg.sh && ./updatepkg.sh # To ensure that you are running on top of the latest xfce4-panel
makepkg -s
Default spacing is 8 and is used when _XKCD_SPACING_VALUE is not set. To set your own preferred value, run.
export _XKCD_SPACING_VALUE=n
Nothing ;)