Building the Athena source tree for Mac OS X

 1. Install Mac OS X
 2. Install OpenAFS
 3. Pick a local source dir [/build/athena]
 4. Pick a local built-product dir [/build/athena.root]
    Set ATHTOOLROOT to it
 5. Symlink /mit/darwin -> /afs/sipb/project/darwin
 6. Add /mit/darwin/src/athena/bin to your PATH
 7. Sync the trees.
   synctree -s /mit/darwin/src/athena/srctree
            -d /build/athena
            -a /mit/darwin/src/athena/buildconfig/rconf
 8. Go into packs/config and run:
       sudo do.sh -d $ATHTOOLROOT install
 9. sudo cp -r /usr/share/autoconf $ATHTOOLROOT/usr/athena/share/
10. For each project directory:
       do.sh dist
       do.sh prepare
       do.sh all
       sudo do.sh -d $ATHTOOLROOT install
11. Do 10. for libathenacompat