Examples in zguide do not work on Mac OS X

I'm trying to use the C++ Majordomo pattern example given in github.com/imatix/zguide.
First of all, I had to modify the c script in order for the examples to commit (I included the patch).
Then, I try to run the C++ mdbroker example:
$> ./mdbroker -v
12-04-30 18:06:36 I: MDP broker/0.1.1 is active at tcp://*:5555
terminate called after throwing an instance of 'zmq::error_t'
what(): Socket operation on non-socket
Abort trap

The weird thing, is that if I only add a few calls to s_console around the brk.bind() call, the broker seems to work:
$> ./mdbroker -v
12-04-30 18:09:14 Before Bind
12-04-30 18:09:14 I: MDP broker/0.1.1 is active at tcp://*:5555
12-04-30 18:09:14 After Bind

Though, if I send an mdworker, I get a bus error:
12-04-30 18:10:38 I: received message:
--------------------------------------
[033] @D5874BA32DDE45DB8D75F7B9A14F0803
[000]
[006] MDPW01
[001] 01
[004] echo
12-04-30 18:10:38 I: registering new worker: @D5874BA32DDE45DB8D75F7B9A14F0803
12-04-30 18:10:38 I: received message:
12-04-30 18:10:38 I: sending HEARTBEAT to worker
--------------------------------------
Bus error

and the mdworker gets:
$> ./mdworker -v
12-04-30 18:10:38 I: connecting to broker at tcp://localhost:5555...
12-04-30 18:10:38 I: sending READY to broker
--------------------------------------
[000]
[006] MDPW01
[001] 01
[004] echo
12-04-30 18:10:43 I: sending HEARTBEAT to broker
--------------------------------------
[000]
[006] MDPW01
[001] 04
12-04-30 18:10:45 W: disconnected from broker - retrying...
mdworker(24927,0x100481000) malloc: *** error for object 0x1003004f0: incorrect checksum for freed object - object was probably modified after being freed.

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    • set a breakpoint in malloc_error_break to debug
      Abort trap

If I use the C example, it works just fine.
Any idea on this?