[OS X TeX] sudo ln -s /opt/X11 /usr/X11
koch at math.uoregon.edu
Mon Jan 5 21:02:11 EST 2015
Recently third parties took over the maintenance of X11. So upgrading OS X sometimes
removes X11, replacing it with a stub. It is easy to locate XQuartz on the network
and reinstall X for OS X.
TeX Live is compiled with X11 active. I can imagine the warning you report when X11 isn’t
available, but I expect pdflatex to work anyway. I haven’t heard of a case of pdflatex
actually failing to work when X11 is missing.
When you install XQuartz, it puts X11 libraries in /opt even though the Mac expects
to find them in /usr/X11. I thought it automatically created symbolic links, but maybe not.
The advice you were given created the symbolic links, but without putting the
expected libraries in /opt. Not very reasonable..
Don’t worry about an X11 warning unless it actually causes a Latex error.
In case of an error, just install XQuartz
More information about the MacOSX-TeX