Does not build on Mac M1 Silicon

[timseed]

No problem with the cmake ...

It seems to have (eventually) found the correct package

-- CMake libzmq package not found, trying again with pkg-config (normal install of zeromq)
-- Found PkgConfig: /opt/homebrew/bin/pkg-config (found version "0.29.2")
-- Found ZeroMQ: /opt/homebrew/lib/libzmq.dylib
-- cppzmq v4.10.0
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Success

But in the final linking step ...

[  7%] Linking CXX executable unit_tests
Undefined symbols for architecture arm64:
  "_zmq_msg_group", referenced from:
      zmq::message_t::group() const in message.cpp.o
  "_zmq_msg_routing_id", referenced from:
      zmq::message_t::routing_id() const in message.cpp.o
  "_zmq_msg_set_group", referenced from:
      zmq::message_t::set_group(char const*) in message.cpp.o
  "_zmq_msg_set_routing_id", referenced from:
      zmq::message_t::set_routing_id(unsigned int) in message.cpp.o
  "_zmq_poller_add", referenced from:
      zmq::poller_t<zmq::no_user_data>::add_impl(zmq::socket_ref, zmq::event_flags, zmq::no_user_data*) in poller.cpp.o
      zmq::poller_t<void>::add_impl(zmq::socket_ref, zmq::event_flags, void*) in poller.cpp.o
      zmq::poller_t<int>::add_impl(zmq::socket_ref, zmq::event_flags, int*) in poller.cpp.o
      zmq::poller_t<zmq::socket_t>::add_impl(zmq::socket_ref, zmq::event_flags, zmq::socket_t*) in poller.cpp.o
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::add_impl(zmq::socket_ref, zmq::event_flags, std::__1::function<void (zmq::event_flags)>*) in active_poller.cpp.o
  "_zmq_poller_add_fd", referenced from:
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::add_impl(int, zmq::event_flags, std::__1::function<void (zmq::event_flags)>*) in active_poller.cpp.o
  "_zmq_poller_destroy", referenced from:
      zmq::poller_t<zmq::no_user_data>::destroy_poller_t::operator()(void*) in poller.cpp.o
      zmq::poller_t<void>::destroy_poller_t::operator()(void*) in poller.cpp.o
      zmq::poller_t<int>::destroy_poller_t::operator()(void*) in poller.cpp.o
      zmq::poller_t<zmq::socket_t>::destroy_poller_t::operator()(void*) in poller.cpp.o
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::destroy_poller_t::operator()(void*) in active_poller.cpp.o
  "_zmq_poller_modify", referenced from:
      zmq::poller_t<zmq::no_user_data>::modify(zmq::socket_ref, zmq::event_flags) in poller.cpp.o
      zmq::poller_t<zmq::socket_t>::modify(zmq::socket_ref, zmq::event_flags) in poller.cpp.o
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::modify(zmq::socket_ref, zmq::event_flags) in active_poller.cpp.o
  "_zmq_poller_new", referenced from:
      zmq::poller_t<zmq::no_user_data>::poller_t() in poller.cpp.o
      zmq::poller_t<void>::poller_t() in poller.cpp.o
      zmq::poller_t<int>::poller_t() in poller.cpp.o
      zmq::poller_t<zmq::socket_t>::poller_t() in poller.cpp.o
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::poller_t() in active_poller.cpp.o
  "_zmq_poller_remove", referenced from:
      zmq::poller_t<zmq::no_user_data>::remove(zmq::socket_ref) in poller.cpp.o
      zmq::poller_t<int>::remove(zmq::socket_ref) in poller.cpp.o
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::remove(zmq::socket_ref) in active_poller.cpp.o
  "_zmq_poller_remove_fd", referenced from:
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::remove(int) in active_poller.cpp.o
  "_zmq_poller_size", referenced from:
      zmq::poller_t<zmq::no_user_data>::size() const in poller.cpp.o
  "_zmq_poller_wait_all", referenced from:
      zmq::poller_t<zmq::no_user_data>::wait_all(std::__1::vector<zmq::poller_event<zmq::no_user_data>, std::__1::allocator<zmq::poller_event<zmq::no_user_data>>>&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l>>) in poller.cpp.o
      zmq::poller_t<int>::wait_all(std::__1::vector<zmq::poller_event<int>, std::__1::allocator<zmq::poller_event<int>>>&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l>>) in poller.cpp.o
      zmq::poller_t<zmq::socket_t>::wait_all(std::__1::vector<zmq::poller_event<zmq::socket_t>, std::__1::allocator<zmq::poller_event<zmq::socket_t>>>&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l>>) in poller.cpp.o
      zmq::poller_t<std::__1::function<void (zmq::event_flags)>>::wait_all(std::__1::vector<zmq::poller_event<std::__1::function<void (zmq::event_flags)>>, std::__1::allocator<zmq::poller_event<std::__1::function<void (zmq::event_flags)>>>>&, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000l>>) in active_poller.cpp.o
ld: symbol(s) not found for architecture arm64

[gummif]

You probably have drafts enabled in cppzmq but not in libzmq, try disabling that feature.