Content of RPM xfce4-panel-devel-4.8.3-2.el6.x86_64.rpm :
/usr/include/xfce4/libxfce4panel-1.0
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/libxfce4panel-config.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/libxfce4panel-enum-types.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/libxfce4panel-enums.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/libxfce4panel.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-arrow-button.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-hvbox.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-panel-convenience.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-panel-image.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-panel-macros-46.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-panel-macros.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-panel-plugin-provider.h
/usr/include/xfce4/libxfce4panel-1.0/libxfce4panel/xfce-panel-plugin.h
/usr/lib64/libxfce4panel-1.0.so
/usr/lib64/pkgconfig/libxfce4panel-1.0.pc
/usr/share/gtk-doc/html/libxfce4panel-1.0
/usr/share/gtk-doc/html/libxfce4panel-1.0/api-index-4-6.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/api-index-4-8.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/api-index-deprecated.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/api-index-full.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/home.png
/usr/share/gtk-doc/html/libxfce4panel-1.0/index.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/index.sgml
/usr/share/gtk-doc/html/libxfce4panel-1.0/left.png
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-1.0.devhelp
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-1.0.devhelp2
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-config.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-convenience.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-enums.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-fundamentals.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-macros.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-miscelleanous.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-plugins.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-register-46-plugins.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-register-gobject-plugins.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-register-plugins.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-widgets.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-xfce-arrow-button.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-xfce-hvbox.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-xfce-panel-image.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/libxfce4panel-xfce-panel-plugin.html
/usr/share/gtk-doc/html/libxfce4panel-1.0/right.png
/usr/share/gtk-doc/html/libxfce4panel-1.0/style.css
/usr/share/gtk-doc/html/libxfce4panel-1.0/up.png