I'm using https://metacpan.org/release/File-Share for this. It takes care of the case when you are in a source directory. (It only works for dist_dir/dist_file, not module_dir/module_file.)
Maybe Dancer2 could switch to File::Share.

In reply to Re^3: Failed to find share dir for dist 'Dancer2' by tinita
in thread Failed to find share dir for dist 'Dancer2' by markong

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