Hi.  I noticed the following lines in GTK2's Portfile:

pre-configure {
    if {[variant_isset quartz]} {
        if { ![file exists ${prefix}/include/cairo/cairo-quartz.h] } {
            ui_msg "\nYou must first build cairo with the quartz variant enabled.  Please\nuninstall (or deactivate) the cairo port and reinstall by running:\n\n\"port install cairo +quartz\"\n"
            exit 1 
        }      
    }

...

variant quartz { configure.args-append --enable-gdktarget=quartz }

Does this mean if I enable the quartz variant, I can compile GTK applications w/o X11?