This file is indexed.

/usr/lib/tcltk/xotcl1.6.7/pkgIndex.tcl is in xotcl 1.6.7-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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set __dir__ $dir 
foreach index [concat \
		   [glob -nocomplain [file join $dir * pkgIndex.tcl]] \
		   [glob -nocomplain [file join $dir * * pkgIndex.tcl]]] {
  set dir [file dirname $index]
  source $index
} 
set dir $__dir__ 
unset __dir__ 

  package ifneeded XOTcl 1.6.7 [list load \
    [file join $dir libxotcl1.6.7.so] XOTcl]