/usr/share/tcltk/tcllib1.19/udpcluster/pkgIndex.tcl is in tcllib 1.19-dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | if {![package vsatisfies [package provide Tcl] 8.5]} {return}
# Backward compatible alias
package ifneeded nameserv::cluster 0.2.5 {package require udpcluster ; package provide nameserv::cluster 0.2.5}
package ifneeded udpcluster 0.3.3 [list source [file join $dir udpcluster.tcl]]
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