dbus on 10.3 chokes because "-undefined suppress" in CFLAGS

[Mark Duling]

Dbus fails on 10.3 with:

/usr/bin/libtool: internal link edit command failed make[3]: ***
[libdbus-1.la] Error 1
make[2]: *** [all] Error 2 make[1]: *** [all-recursive] Error 1 make: ***
[all] Error 2 

http://trac.macosforge.org/projects/macports/ticket/10659

but it builds fine on 10.3 if I remove "-undefined suppress" from the
CFLAGS.

Why would that be?  And is removing it an acceptable fix?

Mark