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  1. or download this
    IO.xs: In function `XS_IO__Seekable_getpos':
    IO.xs:208: `sv_undef' undeclared (first use in this function)
    ...
    IO.xs: In function `XS_IO__File_new_tmpfile':
    IO.xs:252: `sv_undef' undeclared (first use in this function)
    make: *** [IO.o] Error 1
    
  2. or download this
    open FIFO, "<foo" or die "$!\n"; 
    while (<FIFO>) {
    ...
      print "$_\n"; 
      open FIFO, "<foo" or die "$!\n"; 
    }
    
  3. or download this
    foreach word (foo bar baz bletch quux qip qua)
      echo $word > foo
    end