CCLD   libmonoruntimesgen-static.la
  CC     pedump.o
  CCLD   pedump
./.libs/libmonoruntime.a(libmonoruntime_la-threads.o): In function `InterlockedCompareExchange64':
/home/pi/mono/mono-3.2.6/mono/metadata/../../mono/utils/atomic.h:103: undefined reference to `__sync_val_compare_and_swap_8'
/home/pi/mono/mono-3.2.6/mono/metadata/../../mono/utils/atomic.h:103: undefined reference to `__sync_val_compare_and_swap_8'
collect2: ld returned 1 exit status
make[3]: *** [pedump] Error 1
make[3]: Leaving directory `/home/pi/mono/mono-3.2.6/mono/metadata'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/home/pi/mono/mono-3.2.6/mono'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/pi/mono/mono-3.2.6'
make: *** [all] Error 2