FORMAT: Pattern must contain exactly 1 template +()

Hi,

I get the error message above for almost anything.  Example:

--8<---------------cut here---------------start------------->8---
Maxima 5.30.0 http://maxima.sourceforge.net
using Lisp GNU Common Lisp (GCL) GCL 2.6.7 (a.k.a. GCL)
Distributed under the GNU Public License. See the file COPYING.
Dedicated to the memory of William Schelter.
The function bug_report() provides bug reporting information.
(%i1) diff(a/(1+a*b),a);

FORMAT: Pattern must contain exactly 1 template +()
 -- an error. To debug this try: debugmode(true);
--8<---------------cut here---------------end--------------->8---

I found that Valery Pipin reported this as a bug and Robert Dodier has
provided a patch [1].  Before recompiling maxima, I just wanted to check
if this issue has been fixed in any binary release I could just apt-get,
or if there is a git repo that already has a fix (could not find one).

Thanks,

Tamas

[1] http://comments.gmane.org/gmane.comp.mathematics.maxima.general/42222