Hi,

> According to:
>
> http://developer.apple.com/documentation/Darwin/Conceptual/64bitPorting/index.html#//apple_ref/doc/uid/TP40001064
>
> -arch is a good start

I can build 64 bit and multiple architecture binaries using CFLAGS and 
friends so long as no shared libraries are used.

> Have a look at this as well:
>
> http://developer.apple.com/documentation/Porting/Conceptual/PortingUnix/compiling/chapter_4_section_3.html
>
> It mentions additional CFLAGS you need to set.  I was pointed to this
> document when playing with fat binaries on OS/X using pkgsrc.  There may
> be some hints in there for you as well.

Thanks.

> If you could say what version of OS/X your on, what architecture your
> build host is and name a package you're having issues with then I might
> be able to help you out a little more.

10.5.x on both 64 bit PowerPC and 64 bit Intel.

John