Bug: get-face-font: Xemacs21.5.29: org-preview-latex-fragment [7.5]

[Stephen J. Turnbull]

Uwe Brauer writes:

 > The problem seems to be here:
 > 
 > (defun org-dvipng-color (attr)
 >   "Return an rgb color specification for dvipng."
 >   (apply 'format "rgb %s %s %s"
 > 	 (mapcar 'org-normalize-color
 > 		 (color-values (face-attribute 'default attr nil)))))
 > 
 > Xemacs complains about color-values and of course face-attribute.

And XEmacs is right to complain.  This is an org-mode bug.  XEmacs
doesn't have `face-attribute', and we will never have a fully
compatible version because our face properties are mostly specifiers,
which GNU doesn't have.  Specifiers have a rather different API from
ordinary variables, and that's not going to change.

Dunno about `color-values', maybe we can and should synch that -- but
for now, we don't have it.