$ strace -eopen ./817045.pl 2>&1 | grep 'Date/Manip.*= [0-9]\+$'
open("./Date/Manip/Lang/english.pm", O_RDONLY) = 6
open("./Date/Manip.pm", O_RDONLY)       = 8
open("./Date/Manip/Date.pm", O_RDONLY)  = 9
open("./Date/Manip/Obj.pm", O_RDONLY)   = 10
open("./Date/Manip/Base.pm", O_RDONLY)  = 11
open("./Date/Manip/Lang/index.pm", O_RDONLY) = 11
open("./Date/Manip/TZ.pm", O_RDONLY)    = 11
open("./Date/Manip/Zones.pm", O_RDONLY) = 11
open("./Date/Manip/Delta.pm", O_RDONLY) = 8
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