OS X ping6 output isn't parsed correctly

[pilif]

When used with ping6 from OSX (10.11.1), the output is not parsed correctly and no graph is drawn.

pilif@rikku:~| ⇒  ./prettyping -6 www.google.com
▁   0 ▂  10 ▃  20 ▄  30 ▅  40 ▆  50 ▇  60 █  70 ▁  80 ▂  90 ▃ 100 ▄ 110 ▅ 120
 ▆ 130 ▇ 140 █ 150 ▁ 160 ▂ 170 ▃ 180 ▄ 190 ▅ 200 ▆ 210 ▇ 220 █ 230
PING6(56=40+8+8 bytes) 2001:470:26:181:d4f6:1301:6c10:f5a0 --> 2a00:1450:400a:805::1013
16 bytes from 2a00:1450:400a:805::1013, icmp_seq=0 hlim=59 time=12.866 ms
16 bytes from 2a00:1450:400a:805::1013, icmp_seq=1 hlim=59 time=12.086 ms
16 bytes from 2a00:1450:400a:805::1013, icmp_seq=2 hlim=59 time=10.698 ms
16 bytes from 2a00:1450:400a:805::1013, icmp_seq=3 hlim=59 time=12.633 ms
16 bytes from 2a00:1450:400a:805::1013, icmp_seq=4 hlim=59 time=9.783 ms
^C--- www.google.com ping6 statistics ---
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 9.783/11.613/12.866/1.185 ms