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/usr/lib/tcltk/x86_64-linux-gnu/tcllibc/pkgIndex.tcl is in tcllib-critcl 1.19-dfsg-2.

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if {![package vsatisfies [package provide Tcl] 8.6]} {return}
package ifneeded tcllibc 0.3.15 [list ::apply {dir {
    source [file join $dir critcl-rt.tcl]
    set path [file join $dir [::critcl::runtime::MapPlatform]]
    set ext [info sharedlibextension]
    set lib [file join $dir "tcllibc$ext"]
    load $lib Tcllibc
    package provide tcllibc 0.3.15
}} $dir]