Slackware 13.1 -> libgksu:

Name: libgksu
Version: 2.0.12
Arch: x86_64
Rev: 3
Size (compressed): 76 K
Size (uncompressed): 250 K
Required Packages: GConf, ORBit2, atk, cairo, cxxlibs, dbus, dbus-glib, fontconfig, glib2, glibc-solibs, gnome-keyring, gtk+2, libgtop, pango, pixman, startup-notification, util-linux-ng

GKSu is a library that provides a Gtk+ frontend to su and sudo. It supports login shells and preserving environment when acting as a su frontend. It is useful to menu items or other graphical programs that need to ask a user's password to run another program as another user. Homepage: http://www.nongnu.org/gksu/

Download libgksu-2.0.12