_PROTOTYP( int z_out, (int, char *, int, int) );
_PROTOTYP( int z_in, (int, char *, int, int, int) );
_PROTOTYP( int z_flush, (int) );
_PROTOTYP( int z_out, (int, char *, int, int) );
_PROTOTYP( int z_in, (int, char *, int, int, int) );
_PROTOTYP( int z_flush, (int) );