Try 
BEGIN {
    *MainLoop = \&MainLoop;
}

[download]
near the top of your script (near the use statement), or plain 
Mainloop();

[download]
instead of the current call.

Even though the function doesn't exist, if it isn't called, it won't complain.

In reply to Re: Troubles when trying to use Tk conditionally by bart
in thread Troubles when trying to use Tk conditionally by Anonymous Monk

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