Re: beta OPAM instructions

[Thomas Gazagnaire <thomas.gazagnaire@xxxxxxxxx>]

>> On both Linux and MacOS X and get back to me, that would be most useful.  
>> Once we're confident it works without catastrophe, I'll update the website.
> 
> on OSX, everything went smoothly until the compilation of mirage-www:
> 
> objcopy --rename-section '.bss=.mlbss' --rename-section '.data=.mldata' 
> --rename-section '.rodata=.mlrodata' --rename-section '.text=.mltext' 
> main.m.o main.mx.o
> /bin/sh: objcopy: command not found

I've created a pull request to fix the typo in the xen target.

So now everything works fine on OSX for me (from a fresh install of homebrew, 
with OSX 10.6.8).