nginx buildout failing at openssl on Mac OS X Lion

The error message was:

make[1]: *** [objs/src/event/ngx_event_openssl.o] Error 1
make: *** [build] Error 2
nginx-build: Command failed with exit code 2: make

Running the steps suggested here solved the problem: http://code.google.com/p/phusion-passenger/issues/detail?id=650#c2