I think that Inkscape on Mac OS X, when compiled against GTK/Quartz (no X requirement), should run the GUI by default. That is, --with-gui should not be required. Just as Inkscape will run fine on traditional Unix when DISPLAY is set, it will run fine in this environment (without DISPLAY). Does Inkscape require the --with-gui parameter on Windows?
I think that Inkscape on Mac OS X, when compiled against GTK/Quartz (no X requirement), should run the GUI by default. That is, --with-gui should not be required. Just as Inkscape will run fine on traditional Unix when DISPLAY is set, it will run fine in this environment (without DISPLAY). Does Inkscape require the --with-gui parameter on Windows?