if (system('mkfifo',"$FIFO.in")||system('mkfifo',"$FIFO.out")  ) { 
    print STDERR "Cannot create pipes $FIFO.in or $FIFO.in\n";
    exit(1);
  }
[download]

mkfifo is a unix command that is not supported under windows. There is no directly equivalent command, nor any simple way of emulating it.

---

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"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

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Did you download mkfifo from the GNU site? Can you drive it from the Windows command-line?

I suggest you take a look at the Avis::TreeTagger module code - it does nothing more than run the TreeTagger program attached to named pipes. I would not use it on Windows because it uses UNIX hard-coded path names and fork/exec.

In theory all you have to do is run the TreeTagger program only use IPC::Open2 instead. You will then have two file handles to anonymous pipes instead of named pipes.