to get X11 i went to XQuartz here https://xquartz.macosforge.org/trac/wiki/X112.7.5 however the download linke XQuartz-2.7.5.dmg seems to be broken -- couldn't find it anywhere else either. what am i missing?
If you go to the XQuartz home page you will find a link to download XQuartz that should be correct.
If you are running OS X 10.9 then you need version 2.7.5
At the moment it is http://xquartz.macosforge.org/downloads/SL/XQuartz-2.7.5.dmg but our friends at MacOSforge appear to have a broken server. The problem is not yours, it is on their system.
Wait a few more hours and it should be right.
If you can't wait then grab it from my dropbox :-
(note to everyone - I'll remove it in a day or so. Try the website first.)
Xquartz should also be available through homebrew and macports, although I am unsure of the versions available in each.
XQuartz is available in MacPorts as the default X11 server (xorg-server).