For maxima-5.26.0 using SBCL-1,0,55 under Mac OS Lion, I get:
$ uname -v
Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012;
root:xnu-1699.24.23~1/RELEASE_X86_64
$ maxima
Maxima 5.26.0 http://maxima.sourceforge.net
using Lisp SBCL 1.0.55
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) print(true);
true
(%o1) true
(%i2) print(false);
false
(%o2) false
--
Alexander K. Hansen
akh AT finkproject DOT org
Fink User Liaison and Documenter