/usr/share/tcltk/nsf-xotcl2/pkgIndex.tcl is in nsf 2.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
package ifneeded XOTcl 2.0.0 [list source [file join $dir xotcl2.tcl]]