I'm using X11 on a Macintosh to connect to Eclipse 3.3.2 running on
Ubuntu, and the documentation
(http://help.eclipse.org/help33/index.jsp?topic=/org.eclipse.platform.doc.user/tasks/tasks-20.htm)
says that to enlarge some fonts that are unreadably small (e.g., for
Package Explorer), "use the configuration tools provided by the operating
system? .Xdefaults file in Motif". The SWT FAQ
(http://www.eclipse.org/swt/faq.php#motiffontsandcolors) gives some more
detail for Motif, but not quite enough for me to solve the problem on a
Macintosh.
The first problem seems to be that /etc/X11/xinit/xinitrc reads
Xresources rather than .Xdefaults, though the xrdb instructions may work
around that. My second problem was that I couldn't get any of the font
examples I found to work, though that of course might be a problem with my
font installation. (They work acceptably for Xterm, though.) The only
thing I found which worked was "Xft.dpi: 96"
(http://www.tummy.com/journals/entries/jafo_20050120_180533), which seems
to be a good idea in general for a MacBook Pro screen.
I'd suggest adding some Macintosh-specific suggestions to both the
documentation and the FAQ. (Even better, in my opinion, would be to allow
configuring all the important fonts, rather than nearly all of them.)