/usr/share/tcltk/tcllib1.18/pop3/pkgIndex.tcl is in tcllib 1.18-dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | if {![package vsatisfies [package provide Tcl] 8.4]} {return}
package ifneeded pop3 1.9 [list source [file join $dir pop3.tcl]]
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