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Since Femlisp needs only a working ANSI Common Lisp installation with reasonable floating-point performance, it is easy to install given such an environment. More precisely, let us assume that you have one of Allegro CL, CMUCL or SBCL installed, and that you have downloaded Femlisp using either
cvs -z3 -d:pserver:anonymous@cvs.savannah.nongnu.org:/sources/femlisp co femlisp
or
wget -O - http://www.femlisp.org/femlisp-current.tar.gz | tar xzvf -
Then you should be able to start up Femlisp by simply loading the file start.lisp from the directory femlisp. However, this is a rather spartanic version, if you do not have certain other applications for plotting, direct solving or mesh generation installed on your system.
On some operating systems, the setup of a complete environment for Femlisp is easy, and it is described in the following. For operating systems not mentioned here, you can find more information on installing a reasonable environment in Section Detailed installation.