xfce4-panel-dev 4.8.6-2ubuntu2 (armel binary) in ubuntu precise

 In this package, you can find the development files distributed with the
 Xfce4 panel, the main panel of Xfce4 desktop environment. The files in this
 package are mainly going to be of interest for you if you intend to code
 applications which use some of the Xfce4 C panel functions.