The program is set up to run on top of the Cilk parallel multithreaded language. Using Cilk on a multiprocessor speeds up searches by efficiently scheduling the computation on the available processors. If you have only a uniprocessor and do not wish to install Cilk, check the instructions in the README file of the distribution to convert the code in this distribution to C.
The Rubik's cube solver uses lots of memory. As configured, you will need about 1.2 GB of DRAM and the same amount of free disk space. You can get away with using less space by modifying the program according to the instructions in the README. However, you will probably need at least 200 MB in any case.
The solver has been tested on Digital Alphas running Digital UNIX and UltraSPARCs running Solaris. It should work without significant modification on any UNIX system.