tkabber doesn't work with tk-8.4.18

[Aleksey Cheusov <cheusov%tut.by@localhost>]

chat/tkabber doesn't work with tk-8.4.18 under Linux.
When I start it, it says

======================================================
Application initialization failed: Can't find a usable tk.tcl in the following 
directories: 
    /usr/pkg/lib/tcl8.4/tk8.4 /usr/pkg/lib/tk8.4 /usr/pkg/lib/tcl/tk8.4 
/usr/lib/tk8.4 /usr/pkg/library /usr/library /usr/tk8.4.18/library 
/tk8.4.18/library

/usr/pkg/lib/tk8.4/tk.tcl: no event type or button # or keysym
no event type or button # or keysym
    while executing
"bind Listbox <MouseWheel> {
        %W yview scroll [expr {- (%D / 120) * 4}] units
    }"
    invoked from within
"if {[tk windowingsystem] eq "classic" || [tk windowingsystem] eq "aqua"} {
    bind Listbox <MouseWheel> {
        %W yview scroll [expr {- (%D)}] uni..."
    (file "/usr/pkg/lib/tk8.4/listbox.tcl" line 181)
    invoked from within
"source /usr/pkg/lib/tk8.4/listbox.tcl"
    (in namespace eval "::" script line 1)
    invoked from within
"namespace eval :: [list source [file join $::tk_library $file.tcl]]"
    (procedure "SourceLibFile" line 2)
    invoked from within
"SourceLibFile listbox"
    (in namespace eval "::tk" script line 4)
    invoked from within
"namespace eval ::tk {
        SourceLibFile button
        SourceLibFile entry
        SourceLibFile listbox
        SourceLibFile menu
        SourceLibFile panedwindow
        SourceLibFile ..."
    invoked from within
"if {$::tk_library ne ""} {
    if {$tcl_platform(platform) eq "macintosh"} {
        proc ::tk::SourceLibFile {file} {
            if {[catch {
                namespace eval :: ..."
    (file "/usr/pkg/lib/tk8.4/tk.tcl" line 407)
    invoked from within
"source /usr/pkg/lib/tk8.4/tk.tcl"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 [list source $file]"


This probably means that tk wasn't installed properly.
======================================================

Everything works fine with tk-8.4.16 though.

-- 
Best regards, Aleksey Cheusov.