ACL2 Version 6.3
Copyright (C) 2013, Regents of the University of Texas
ACL2 is licensed under the terms of the LICENSE file distributed with ACL2.
Obtaining Allegro Common Lisp
The website for Allegro Common Lisp, a commercial implementation, is
You may be able to obtain a trial version there.
Obtaining CCL (OpenMCL)
Clozure CL (CCL) was formerly known as OpenMCL. Quoting from the Clozure CL web page: ``Clozure CL is a fast, mature, open source Common Lisp implementation that runs on Linux, Mac OS X and BSD on either Intel x86-64 or PPC.''
For Windows users: We observed stalls using CCL 1.5 on Windows (in May, 2010), though not with CCL 1.4. We have been told by a CCL implementor that this bug has been fixed, and people running CCL 1.5 under Windows at a revision less than 13900 should update.
Here is an easy way to obtain and build the latest version (generally
recommended) for Linux on running on x86 or x86-64. First execute the
following shell command to create a
ccl directory, but
linuxx86, if appropriate, any of
darwinx86 (which we use for modern Macs),
svn co http://svn.clozure.com/publicsvn/openmcl/trunk/linuxx86/cclNote: if you prefer the latest release, you can obtain that instead, for example as follows (but replace "1.9" by the latest version, for example as described at
http://ccl.clozure.com/download.html, and replace
linuxx86if appropriate as described above).
svn co http://svn.clozure.com/publicsvn/openmcl/release/1.9/linuxx86/cclNext rebuild the executable by issuing the following commands, but replace "
./lx86cl64" by a suitable executable; e.g., for 64-bit Darwin (on Mac OS) use "
./lx86cl64 (rebuild-ccl :full t) (quit) ./lx86cl64 (rebuild-ccl :full t) (quit)
Now your CCL executable is up to date. Next, create a suitable
script, say as follows, where
DIR is the full pathname
for the directory above the new
#!/bin/sh tmp=`uname -a | fgrep x86_64` export CCL_DEFAULT_DIRECTORY=DIR/ccl # Start up 64-bit or 32-bit lisp, respectively: if [ "$tmp" != "" ] ; then \ DIR/ccl/scripts/ccl64 $* ; \ else \ DIR/ccl/scripts/ccl $* ; \ fi
my-scriptthen on linux you might want to execute the following shell command.
chmod +x my-scriptYour script (invoked with a suitable pathname, or just the filename if the directory is on your path) will now start the updated CCL lisp image.
More details if you want or need them:
Step 3 in
has more details on building from source.
Alternatively, you can download a gzipped tar
file; see the main CCL
page, or visit the page of stable
Clozure CL snapshots for ACL2 users. (Subversion and gzipped tar
files are great, but not so much a CCL disk image (
file), as we have had a report of the extracted CCL opening its own
window when you start it up.) If you don't want to write your own
script (as suggested above) then after obtaining CCL, you may wish to
ccl/scripts/ccl or file
ccl/scripts/ccl64, depending on whether you want to
use a 32-bit or 64-bit version (respectively).
CLISP is a non-commercial Common Lisp implementation, available from
Obtaining CMU Common Lisp
CMU Common Lisp (sometimes called CMUCL) is a non-commercial Common Lisp
implementation, available from
You might be able to download a binary Debian package for ACL2. Thanks to Camm Maguire for maintaining this package. Note however that it may take some time after each ACL2 release for this binary Debian package to be updated for that release. Here is a shell command that might be used to obtain that package (if running Debian).
apt-get -q install gcl gcl-docOtherwise, it should be easy to obtain and build GCL yourself. There are two recommended versions of GCL for building ACL2: GCL 2.6.8 and GCL 2.6.10. (GCL 2.6.9, which is not recommended, has some issues that were fixed in GCL 2.6.10.) GCL 2.6.8 appeared initially to be faster for ACL2 regressions than GCL 2.6.10, but we recently measured GCL 2.6.10 (actually GCL 2.6.10pre, as of Oct. 1, 2013) to be slightly faster, using non-ANSI builds for both. We have also had better success with GCL 2.6.10 than GCL 2.6.8 on a Mac, where 2.6.8 ran out of memory for two regression tests but 2.6.10 (again, actually 2.6.10pre) did not. Note that GCL 2.6.10 may have better ANSI support than 2.6.8, and ANSI support is needed if you choose to build ACL2(h)).
You can fetch GCL 2.6.8 as a tarball from
main GNU website for
From GCL source you can build an executable by extracting from the
tarball, standing in the resulting
gcl/ directory, and
issuing one of the following commands.
# Recommended for 64-bit Linux: ./configure --enable-maxpage=1048576 && make # Recommended for Mac OS: ./configure && make # If you want an ANSI build # (but add "--enable-maxpage=1048576" in the case of 64-bit Linux, as above): ./configure --enable-ansi && makeAs of early October 2013, GCL 2.6.10 is not yet available as a tarball. However, you can get a pre-release (which we expect to work fine, having used it successfully ourselves) like this (assuming you have
git clone git://git.sv.gnu.org/gcl.git cd gcl git checkout Version_2_6_10pre cd gclThen run
makeas indicated above.
LispWorks is a commercial Common Lisp implementation. You can download
a free, restricted, version
You may ask the vendor for an evaluation license for the full product
if you are considering purchasing a license.
SBCL (Steel Bank Common Lisp) is a non-commercial Common Lisp
implementation, available from
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