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Boost 1.85 removed some deprecated code in filesystem module which is still used in columnstore: - The boost/filesystem/convenience.hpp was removed but columnstore does not use any functionality from that file except indirect includes. Therefore this include is removed or replaced with more general boost/filesystem.hpp. The convenience.hpp header file was deprecated in filesystem V3 introduced in Boost 1.46.0. - `normalize` method was removed and users are suggested to replace it with `lexically_normal` method, which was introduced in Boost 1.60.0. Original `normalize` call is preserved for backward compatibility with old Boost version, however`, `lexically_normal` method is preferably used with Boost 1.60.0 and newer. - The `copy_option` was removed in favor of `copy_options` (note the trailing 's'), but enum values were renamed. Namely, `fail_if_exists` is replaced with `none` and `overwrite_if_exists` is replaced with `overwrite_existing`. The `copy_options` was introduced in Boost 1.74.0. New form is used instead, but a backward compatibility layer for Boost 1.73.0 and older was introduced in boost_copy_options_compat.hpp file. This solution seems to be less awkward than using multiple #if #else #endif blocks in source code.