hi,
I am using inkscape on a mac tiger. I don't
use Apple X11, I use instead XDarwin, the
xfree implementation that can be installed via fink.

For people who also use this version of the X window system, here is how I was able to launch inkscape 46 for tiger: First comment or supress in the file:

/Applications/Inkscape.app/Contents/Resources/script

the following line (which prevents XDarwin detection):

ps -wx -ocommand | grep -e '[X]11' > /dev/null || exit 11

Make sure that the X server is running, then launch Inkscape by typing in a terminal :
/Applications/Inkscape.app/Contents/Resources/script
That's it. Inkscape will report some errors, which have to do with table 85 but everything works fine.