pango 64-bit universal builds on Mac OS X

[Ryan Schmidt <pango-2009a ryandesign com>]

Hello. I'm the maintainer of the pango and cairo ports in MacPorts.  
We seem to be on a push recently to enable full 4-way universal  
builds in various ports. This means building for all four Mac  
architectures: i386 ppc x86_64 ppc64.

Cairo had trouble building 4-way universal because it attempted to  
use ATSUI functions, which are now legacy functions that are not  
available on 64-bit. We added #ifdef's to not use those functions  
when building 64-bit. Here is our ticket on that issue:

http://trac.macports.org/ticket/16007

Here is the upstream bug report:

http://bugs.freedesktop.org/show_bug.cgi?id=15702

Now we have a similar problem with Pango. Here is our ticket on this  
issue:

http://trac.macports.org/ticket/17049

It contains some patches and comments by one of our maintainers,  
including an implementation that uses CoreText instead of ATSUI. This  
should work on 64-bit Mac OS X 10.5, but CoreText is not available on  
earlier Mac OS X, so it won't help build 64-bit on Mac OS X 10.4.  
Then again cairo is still having troubles building 64-bit on Tiger too.

Should I file an issue in the issue tracker, or should some  
discussion on the correct fix take place here first?