wire library endTransmission() still not working with Due

i have read posts endtransmission() returning non-zero on successful transmits. supposed have been fixed in arduino 1.5.7.
i testing tinyrtc board. i2c scanner relies upon wire.endtransmission()  returns 2 (nack) rtc address (0x68).
however, if use rtcdue library not use wire, can access , read rtc.
my conclusion wire still not fixed due.

any help? make extensive use of i2c , working wire library due.

i discovered rtclib assumes connection second i2c port on due, without giving option port connected to. once sorted out, works expected.

#ifdef __avr__
#include <avr/pgmspace.h>
#define wire wire
#else
#define progmem
#define pgm_read_byte(addr) (*(const unsigned char *)(addr))
#define wire wire // wire1  --- have change wire1  wire use standard i2c port on due
#endif

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