build failure

[Bureaucromancer]

`home/ned/dev/i3-pager-git/src/i3-pager/i3ipc++/src/ipc.cpp: In constructor ‘i3ipc::connection::connection(const std::string&)’:
/home/ned/dev/i3-pager-git/src/i3-pager/i3ipc++/src/ipc.cpp:337:9: error: ‘signal_event’ was not declared in this scope; did you mean ‘sigevent’?
  337 |         signal_event.connect([this](EventType  event_type, const std::shared_ptr<const buf_t>&  buf) {
      |         ^~~~~~~~~~~~
      |         sigevent
/home/ned/dev/i3-pager-git/src/i3-pager/i3ipc++/src/ipc.cpp: In lambda function:
/home/ned/dev/i3-pager-git/src/i3-pager/i3ipc++/src/ipc.cpp:447:33: error: ‘signal_binding_event’ was not declared in this scope; did you mean ‘signal_window_event’?
  447 |                                 signal_binding_event.emit(*bptr);
      |                                 ^~~~~~~~~~~~~~~~~~~~
      |                                 signal_window_event
/home/ned/dev/i3-pager-git/src/i3-pager/i3ipc++/src/ipc.cpp: In member function ‘void i3ipc::connection::handle_event()’:
/home/ned/dev/i3-pager-git/src/i3-pager/i3ipc++/src/ipc.cpp:491:15: error: ‘class i3ipc::connection’ has no member named ‘signal_event’
  491 |         this->signal_event.emit(static_cast<EventType>(1 << (buf->header->type & 0x7f)), std::static_pointer_cast<const buf_t>(buf));
      |               ^~~~~~~~~~~~
`