Compile el ejemplo de ZeroMQ C de hello world, compile flags?

Intentando compilar el ejemplo hello_world.c del tutorial de zeromq:http://zguide.zeromq.org/page:all#Ask-and-Ye-Shall-Receive Bastante seguro tengo todo instalado en OSX Mountain Lion.

clang -Wall hwserver.c -o hwserver

me da un error

Undefined symbols for architecture x86_64:  
"_zmq_bind", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_ctx_new", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_msg_close", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_msg_data", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_msg_init", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_msg_init_size", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_msg_recv", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_msg_send", referenced from:  
  _main in hwserver-OgrEe6.o  
"_zmq_socket", referenced from:  
  _main in hwserver-OgrEe6.o  
ld: symbol(s) not found for architecture x86_64  
clang: error: linker command failed with exit code 1 (use -v to see invocation)

No soy el que tiene más experiencia en C. No estoy seguro de si estoy agregando una marca de compilación para el dylib o los encabezados zmq o si mi $ PATH está desactivado.

en / usr / local / lib:

libzmq.3.dylib
libzmq.a
libzmq.dylib
libzmq.la

y en / usr / local / include:

zmq.h
zmq_utils.h

y echo $ PATH:

/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/local/lib/:/usr/local/include/

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