Here is a mapping from old names to new names, as best as I know. This can help you to recompile applications which were ported to Linux with the old structure member names.
Old nameNew name
_base_IO_buf_base
_ebuf_IO_buf_end
_eback(?)_IO_base
_gbase_IO_buf_base
_gptr_IO_read_ptr
_egptr_IO_read_end
_pbase_IO_write_base
_pptr_IO_write_ptr
_epptr_IO_write_end

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