Even simpler, you can use absolute_file_name(pack(''), Dir) and let absolute_file_name expand the pack directory alias. (The only difference this way is that Dir will have a trailing slash, but that shouldn’t matter in most cases.)
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I always use
?- absolute_file_name(pack('.'), Dir).
Dir = '/home/janw/.local/share/swi-prolog/pack'.
Note that if you use absolute_file_name/3, we can use this to enumerate all possible locations for the packs:
?- absolute_file_name(pack('.'), Dir, [file_type(directory), access(write), solutions(all)]).
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