DiskStation> make -k
CC              build.linux/tvheadend
./build.linux/src/packet.o: In function `atomic_add':
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
./build.linux/src/streaming.o:/root/tvheadend/src/atomic.h:24: more undefined references to `__sync_fetch_and_add_4' follow
./build.linux/src/timeshift/timeshift_filemgr.o: In function `atomic_add_u64':
/root/tvheadend/src/atomic.h:36: undefined reference to `__sync_fetch_and_add_8'
/root/tvheadend/src/atomic.h:36: undefined reference to `__sync_fetch_and_add_8'
/root/tvheadend/src/atomic.h:36: undefined reference to `__sync_fetch_and_add_8'
./build.linux/src/timeshift/timeshift_writer.o: In function `atomic_add_u64':
/root/tvheadend/src/atomic.h:36: undefined reference to `__sync_fetch_and_add_8'
./build.linux/src/timeshift/timeshift_reader.o: In function `atomic_add':
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
./build.linux/src/dvb/dvb_adapter.o: In function `atomic_add':
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
./build.linux/src/cwc.o: In function `atomic_add':
/root/tvheadend/src/atomic.h:24: undefined reference to `__sync_fetch_and_add_4'
collect2: ld returned 1 exit status
make: *** [build.linux/tvheadend] Error 1
make: Target `all' not remade because of errors.