compiling linked-in driver on Mac OSX

[Jacob Vorreuter]

I'm having trouble compiling and loading the example driver from http://www.erlang.org/doc/tutorial/c_portdriver.html

This is the driver source that I'm using: http://gist.github.com/418491

I'm using the gcc flags mentioned in other posts for compiling and linking on Mac OSX:

$ gcc -o example_drv.so example_drv.c -bundle -flat_namespace -undefined suppress -I/usr/local/lib/erlang/erts-5.7.5/include/

Erlang R13B04 (erts-5.7.5) [source] [smp:2:2] [rq:2] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V5.7.5  (abort with ^G)
1> erl_ddll:load(".", "example_drv").
{error,{open_error,-10}}
2> erl_ddll:format_error({open_error,-10}).
"dlopen(./example_drv.so, 2): no suitable image found.  Did find:\n\t./example_drv.so: mach-o, but wrong architecture"

Any ideas as to why I'm getting this "wrong architecture" error when trying to load the driver?  I'm using R13B04 on Snow Leopard.

Thanks,

Jake