This is a structure (typically an alias to the system `struct stat` or one of its near brethren) that is defined in `tcl.h`. It is used with the [Tcl_FSStat] function, and is all too often a problem – especially on [Windows] – because its actual definition should depend on the libc being used and thus the compiler options need to be correct (an all-too-rare occurrence, alas).

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