| system_ss.add(files( | 
 |   'announce.c', | 
 |   'checksum.c', | 
 |   'dump.c', | 
 |   'eth.c', | 
 |   'filter-buffer.c', | 
 |   'filter-mirror.c', | 
 |   'filter.c', | 
 |   'hub.c', | 
 |   'net-hmp-cmds.c', | 
 |   'net.c', | 
 |   'queue.c', | 
 |   'socket.c', | 
 |   'stream.c', | 
 |   'dgram.c', | 
 |   'util.c', | 
 | )) | 
 |  | 
 | if get_option('replication').allowed() or \ | 
 |     get_option('colo_proxy').allowed() | 
 |   system_ss.add(files('colo-compare.c')) | 
 |   system_ss.add(files('colo.c')) | 
 | endif | 
 |  | 
 | if get_option('colo_proxy').allowed() | 
 |   system_ss.add(files('filter-rewriter.c')) | 
 | endif | 
 |  | 
 | system_ss.add(when: 'CONFIG_TCG', if_true: files('filter-replay.c')) | 
 |  | 
 | if have_l2tpv3 | 
 |   system_ss.add(files('l2tpv3.c')) | 
 | endif | 
 | system_ss.add(when: slirp, if_true: files('slirp.c')) | 
 | system_ss.add(when: vde, if_true: files('vde.c')) | 
 | if have_netmap | 
 |   system_ss.add(files('netmap.c')) | 
 | endif | 
 |  | 
 | system_ss.add(when: libxdp, if_true: files('af-xdp.c')) | 
 |  | 
 | if have_vhost_net_user | 
 |   system_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('vhost-user.c'), if_false: files('vhost-user-stub.c')) | 
 | endif | 
 |  | 
 | if host_os == 'windows' | 
 |   system_ss.add(files('tap-win32.c')) | 
 | elif host_os == 'linux' | 
 |   system_ss.add(files('tap.c', 'tap-linux.c')) | 
 | elif host_os in bsd_oses | 
 |   system_ss.add(files('tap.c', 'tap-bsd.c')) | 
 | elif host_os == 'sunos' | 
 |   system_ss.add(files('tap.c', 'tap-solaris.c')) | 
 | else | 
 |   system_ss.add(files('tap.c', 'tap-stub.c')) | 
 | endif | 
 | if have_vhost_net_vdpa | 
 |   system_ss.add(when: 'CONFIG_VIRTIO_NET', if_true: files('vhost-vdpa.c'), if_false: files('vhost-vdpa-stub.c')) | 
 | endif | 
 |  | 
 | vmnet_files = files( | 
 |   'vmnet-common.m', | 
 |   'vmnet-bridged.m', | 
 |   'vmnet-host.c', | 
 |   'vmnet-shared.c' | 
 | ) | 
 | system_ss.add(when: vmnet, if_true: vmnet_files) | 
 | subdir('can') |