Armed Bear

The right of the people to keep and arm bears shall not be infringed!

Armed Bear Common Lisp

ABCL is now maintained by Erik Huelsmann and other contributors. For more information, please see the official ABCL web site.


XCL is a new native-code implementation of Common Lisp. It features a kernel written in C++ and an optimizing compiler written in Lisp with backends for x86 and x86-64.

XCL runs on Linux, FreeBSD (tested only on x86, but it might work on x86-64 too), and 32-bit Windows.

The latest development snapshot is xcl- (Oct 12 2010 5:32 am PST).

On Linux and FreeBSD, you should be able to build XCL by simply running make in the top-level source directory. If all goes well, you'll end up with an executable called xcl in the top-level source directory. Run this executable and do (REBUILD-LISP) at the REPL prompt to compile the .lisp source files, then restart.

Building on Windows should be equally straightforward if you have the right toolchain setup, which is basically MinGW and MSYS (I'm currently using g++ 4.4.0 and make 3.81).

The latest snapshot fails 113 out of 21609 tests in the XCL fork of pfdietz's ANSI tests, included in the tarball (use RUN-ANSI-TESTS to run the tests).

The latest snapshot builds SBCL successfully and completes the test suites of CL-PPCRE 1.3.0, Ironclad 0.22 and Alexandria with no unexpected failures.

XCL is now on GitHub:

    git clone git://

License is GPL.

Recent Changes (Oct 12 2010 5:32 am PST) (Nov 23 2009 9:18 am PST) (Nov 3 2009 11:45 am PST) (Oct 28 2009 8:11 am PDT) (Oct 19 2009 10:53 am PDT) (Oct 9 2009 9:45 am PDT) (Oct 4 2009 7:33 am PDT) (Oct 1 2009 11:55 am PDT)