------------------------------

 1. Create a base directory and change to it

     mkdir cmucl ; cd cmucl

 2. Fetch the sources and put them into the base directory

 ```

     tar xzf /tmp/cmucl-source.tar.gz

 ```

     or, if you want to use the git sources directly:

 ```

     git clone https://gitlab.common-lisp.net/cmucl/cmucl.git

 ```

     Whatever you do, the sources must be in a directory named src

     inside the base directory.  Since the build tools keep all

     generated files in separate target directories, the src directory

    Use this to build from a version of CMUCL that is very close to the

    sources you are trying to build now:

    bin/build.sh -C "" -o "<name-of-old-lisp> <options-to-lisp>"

    This will build CMUCL 3 times, each time with the result of the

    previous build.  The last time, the additional libraries like CLX,

    For these, you can use this:

    bin/build.sh -C "" -o "<old-lisp>" -B boot1.lisp -B boot2.lisp

    The bootstrap files listed with the -B option (as many as needed)

    are loaded in order, so be sure to get them right.

 building from, then you need to use b) or c) above.  You may need to

 read the bootfiles for additional instructions, if any.  

 will give a quick summary.  Read bin/build.sh for more

 information. 

     The remaining arguments used to create the name of the tarfiles.  The

     names will have the form:

 ```

    cmucl-<version>-<arch>-<os>.tar.bz2

    cmucl-<version>-<arch>-<os>.extras.tar.bz2

 ```

     Of course, the "bz2" will be "gz" if you specified gzip compression

     instead of bzip.

 -c, -r, and -l options for cross-build-world.sh.  The -c option cleans

 out the targe and cross directories; -r does step 4; and -l does step

 5.