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 name
New 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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