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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

open FIFO, "<foo" or die "$!\n"; 
while (<FIFO>) {
...
  print "$_\n"; 
  open FIFO, "<foo" or die "$!\n"; 
}

foreach word (foo bar baz bletch quux qip qua)
  echo $word > foo
end