system_ss.add(when: seccomp, if_true: files('qemu-seccomp.c'))
system_ss.add(when: fdt, if_true: files('device_tree.c'))
-system_ss.add(when: 'CONFIG_LINUX', if_true: files('async-teardown.c'))
+if targetos == 'linux'
+ system_ss.add('async-teardown.c')
+endif