The buffers in zlib are (Bytef *) which is unsigned and so Subversion's (char *) buffers need to be cast.
The buffers in zlib are (Bytef *) which is unsigned and so
Subversion's (char *) buffers need to be cast.

* subversion/libsvn_subr/stream.c
  (read_handler_gz): Cast (char *) to (Bytef *). 
  (write_handler_gz): Cast (const char *) to (Bytef *).

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