or download this
$ strace -eopen ./817045.pl 2>&1 | grep 'Date/Manip.*= [0-9]\+$'
open("./Date/Manip/Lang/english.pm", O_RDONLY) = 6
...
open("./Date/Manip/Recur.pm", O_RDONLY) = 8
open("./Date/Manip/TZ/euberl00.pm", O_RDONLY) = 4
open("./Date/Manip/TZ/etgmt00.pm", O_RDONLY) = 4