how to build gimp +quartz?

[Olaf Foellinger]

Hi,

today I've tried to build 

$ sudo port install gimp-app +quartz

on a relative freshly installed macports. Before I've installed the x11
version of gnucash.

Macports has installed the x11 version of gimp to. What do I have to do
to install the quartz version? My next target would be the quartz
version of gnucash which should be possible according to 

http://wiki.gnucash.org/wiki/MacOSX/Quartz 

Gruß Olaf