It's been a few months since I've tried building Ogre. I'm currently trying with xcode 4.3.1. I saw there is an issue with cmake. I downloaded the 2.8.8 rc1 from http://www.kitware.com/blog/home/post/248. It looks like the issue is supposed to be fixed in that issue.
It looks like cmake isn't picking up on the cmake modules that come with Ogre. When I run the build script, I get the following:
I have updated that wiki page with some additional instructions. I have a feeling that you need to either install the command line tools, set the xcode path or both.
I met the same error on the 1.8.1 source "ogre_src_v1-8-1.tar.bz2".
I found the cause is because of unzip software. I download the file in windows, and uses alzip to unzip it.
the result directory is 169M in size.
if unzipped in Mac, the correct size is 337M.
I tried another unzip software 7zip, works fine. so it is the alzip's problems