[R] Histogram font

[Christopher Willmot]

The hist() command produces this message on my machine...

Error in title(main = main, sub = sub, xlab = xlab, ylab = ylab, ...) :
         X11 font at size 14 could not be loaded

How can I either (a) determine what font is required,
  or (b) specify one of the fonts I have available?

This problem is specific to hist(), plot() works fine.
I am using R on SuSE Linux v9.3, from the KDE desktop.

-- 
Christopher Willmot