NOTE: These instructions assume that you are using Linux. If you are on a Mac using Darwin (as is typical), then everywhere below, replace "linuxx86" by "darwinx86" and "lx" by "dx".
To obtain Clozure Common Lisp (CCL), first create a ccl/ subdirectory as follows.
svn co http://svn.clozure.com/publicsvn/openmcl/trunk/linuxx86/ccl
Then install as follows.
On 64-bit machine: cd ccl ./lx86cl64 Welcome to Clozure Common Lisp Version .... ? (rebuild-ccl :full t) ... ? (quit) ./lx86cl64 Welcome to Clozure Common Lisp Version .... ? (rebuild-ccl :full t) ... ? (quit)