asterisk: undefined reference to `__sync_fetch_and_add_4'

[Randy Bush]

i386 very current
-DWITHOUT_ODBC -DWITHOUT_ZAPTEL -DWITHOUT_H323

/usr/ports/net/asterisk/work/asterisk-1.4.18.1/include/asterisk/lock.h:1101:
undefined reference to `__sync_fetch_and_add_4'
manager.o(.text+0x6e6c):/usr/ports/net/asterisk/work/asterisk-1.4.18.1/include/asterisk/lock.h:1101:
undefined reference to `__sync_fetch_and_add_4'
utils.o(.text+0xdd4): In function `ast_atomic_dec_and_test':
/usr/ports/net/asterisk/work/asterisk-1.4.18.1/include/asterisk/lock.h:1147:
undefined reference to `__sync_sub_and_fetch_4'
utils.o(.text+0xded): In function `ast_atomic_fetchadd_int':
/usr/ports/net/asterisk/work/asterisk-1.4.18.1/include/asterisk/lock.h:1101:
undefined reference to `__sync_fetch_and_add_4'
gmake[1]: *** [asterisk] Error 1
gmake: *** [main] Error 2
*** Error code 2

randy