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|Apple specific Operating System Interaction|
Non-portable Apple MacOS specific predicates are prefixed woth
enfor english followed by an undercore and an identifier for the Region in the MacOS Language & Region preferences. For example, with the primary language set to “English (UK)'' and the Region to “United Kingdom'' we get
en_GB. This relates to the locale identifier
en_GB.UTF-8. Unfortunately it is not that simple. For example, we can combine the primary language “English (UK)'' with the Region “Netherlands'' to end up with
en_NLwhich is not a valid MacOS locale.