FWIW, that bufferoverflowU stuff appears to be geared to the microsoft compiler and sdk, see Bug #46112 for Tk: Problems compiling on x64 ActivePerl (Win Vista 64)

So you might get microsoft compiler and use that instead of mingw compiler, see How to install CPAN modules into ActivePerl

In reply to Re: Installing Tk problems with Active State on Windows by Anonymous Monk
in thread Installing Tk problems with Active State on Windows by Ray Smith

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