===========================================================================
$NetBSD: MESSAGE,v 1.1 2015/10/01 12:55:09 tnn Exp $

To finish the installation of pkgsrc X11 on your Mac:

$ sudo mv /Applications/Utilities/X11.app /Applications/Utilities/X11.app.bak
$ sudo ln -s ${PREFIX}/Applications/Utilities/X11.app /Applications/Utilities

$ echo "${PREFIX}/bin/xterm &" > ~/.xinitrc
$ echo ${PREFIX}/bin/quartz-wm >> ~/.xinitrc
$ ${PREFIX}/bin/startx -- ${PREFIX}/bin/Xquartz

You can also launch X11.app from finder instead of the last step.

===========================================================================