lib/open.t
 225 $ENV{LC_ALL} = $ENV{LANG} = 'ru_RU.KOI8-R';

t/op/exec.t
  33 $ENV{LC_ALL}   = 'C';           # Forge English error messages.


t/op/groups.t
  10     $ENV{LC_ALL} = "C"; # so that external utilities speak English


t/op/lfs.t
 119 $ENV{LC_ALL} = "C";