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This follows other Boost libraries (in particular, Boost.System) in treating Cygwin as a POSIX platform rather than Windows. This is a breaking change, but apparently downstream Boost.Filesystem packages on Cygwin are patched to the same effect. As part of this change, AT_NO_AUTOMOUNT is made an optional requirement to enable POSIX *at APIs. This flag is not POSIX-standard and is not supported on Cygwin, while *at APIs are.