endif
# TODO: this is very incomplete
-if ['linux', 'cygwin', 'gnu', 'gnu/kfreebsd'].contains(host_machine.system())
+if ['linux', 'cygwin', 'gnu', 'freebsd', 'gnu/kfreebsd'].contains(host_machine.system())
pre_args += '-D_GNU_SOURCE'
elif host_machine.system() == 'sunos'
pre_args += '-D__EXTENSIONS__'