+ After you copy the files from the Installation disk to your /Applications folder, I think it's helpful to do these additional steps. In a Terminal, type:
+
+ sudo ln -s /Applications/Racket*/DrRacket.app /Applications/
+ ln -s /Applications/Racket*/bin/racket ~/bin/
+
+ (If you get an error about ".../bin/: No such file or directory", then you didn't follow the Preliminary instructions above.)
+
+ Then you can launch Racket either by double-clicking the DrRacket icon in
+ your Applications folder (this gives you the GUI interface); or by typing
+ `racket` in a Terminal (this gives you the command-line version).
+
+ Instead of, or in addition to, the first line above, you could drag the *DrRacket.app* icon to your Dock.
+
+* **To instead install Chicken Scheme on Mac without MacPorts**
+
+ Here are the exact steps I just verified worked. Note that I *first installed the Haskell Platform*, described further down this page; that installed some developer tools that were needed to build and install Chicken. If you don't know how to open a Terminal, move between directories, copy / rename / delete files and so on, then you're probably best off not doing this. You could break something.
+
+ 1. Go to <http://code.call-cc.org>, and click the "Source code" link near the top. Current version is 4.9.0.1, released November 2014. This should fetch a file to your download folder, and will probably automatically unpack that file into a folder, "chicken-4.9.0.1". Click on that folder and press command-C / Copy, then open a Terminal.
+ 2. In the terminal type `cd` followed by a space, then press command-V / Paste. Then press enter. This will move your session into the folder you just downloaded.
+ 3. Type `less README` and read that file.
+ 4. Type `make PLATFORM=macosx XCODE_DEVELOPER= XCODE_TOOL_PATH=/usr/bin PREFIX=$HOME` <!-- PREFIX defaults to /usr/local -->
+
+ The options starting with `XCODE_` are to tell the Chicken build scripts that I've got the developer tools installed in my main system, rather than as part of Xcode. (That's where the Haskell Platform installer put them.) Continuing:
+
+ 5. Wait a while while Chicken builds.
+ 6. If it finishes with no errors, then type `make PLATFORM=macosx XCODE_TOOL_PATH=/usr/bin PREFIX=$HOME install`. This will prompt you for your account password, and then install Chicken underneath your `/usr/local` directory.
+ 7. At this point you can type `which chicken`. It should give you an answer of "/Users/yourname/bin/chicken".
+ 8. In your terminal, type `chicken-install r7rs datatype matchable monad`. <!-- with "-sudo" if you installed chicken in /usr/local --> This will download, build, and install a few extensions (Chicken calls them "eggs") relevant to ideas we'll be working with in this course.
+