How do I cause standalone X11 apps to use MacPorts X11?

[Jeremy Lavergne]

Instructions from the maintainer of MacPorts' xorg-server (from the -dev list):

On Mar 26, 2014, at 14:28, Jeremy Huddleston Sequoia <jeremyhu at macports.org> wrote:

> The stubs are there for projects that linked against /usr/X11.  All you really need to do is setup symlinks to redirect them to your MP prefix.  I recommend starting with the XQuartz hook (which is installed on the system to setup the links to /opt/X11) and then just changing them to the MacPorts prefix (/opt/local in the example below):
> 
> sudo port -v install xorg
> launchctl load -w /Library/LaunchAgents/org.macports.startx.plist
> sudo /usr/X11/libexec/xquartz_postinst.sh
> sudo rm /usr/X11
> sudo rm /usr/X11R6
> sudo ln -s /opt/local /usr/X11
> sudo ln -s /opt/local /usr/X11R6
> 
> Note that loading the launchd.plist requires logout and login for $DISPLAY to propagate.
> 
> --Jeremy