/usr/lib/pkgIndex.tcl is in libhamlib2-tcl 1.2.15.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
package ifneeded Hamlib 1.0 [list load [file join $dir hamlibtcl-1.0.so] Hamlib]