fatal error: 'cairo-quartz.h' file not found

[Ryan Schmidt <pango-2012d ryandesign com>]

Hello, I'm the maintainer of pango in MacPorts. I'm trying to update our development-version port, pango-devel, to the new 1.31 branch. I got ports created for graphite2 and harfbuzz (to get past the errors shown here: https://mail.gnome.org/archives/gtk-i18n-list/2012-August/msg00009.html), but now the problem with 1.31.0 or 1.31.1 is this error:


In file included from pangocairo-coretextfont.c:32:
./pangocairo-coretext.h:28:10: fatal error: 'cairo-quartz.h' file not found
#include <cairo-quartz.h>
         ^
1 error generated.


I have cairo installed for X11 support only, not Quartz; this was always fine before, and is the default way cairo has been installed in MacPorts for years. Is this a regression in the new pango that will yet be corrected, or is it no longer supported to use pango on OS X with cairo without Quartz support?