X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=how_to_get_the_programming_languages_running_on_your_computer.mdwn;h=235b8abcc403c21e4a7780e16bc6ed763b1a4ee8;hp=8e65a541d085848607e50d29d90437dfd329b986;hb=f8390e57abfe70f52db08bee2afaf5879e8f914a;hpb=50c4dde527cfc81a07e88ec2fb41ff61bf200d9f

diff --git a/how_to_get_the_programming_languages_running_on_your_computer.mdwn b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
index 8e65a541..235b8abc 100644
--- a/how_to_get_the_programming_languages_running_on_your_computer.mdwn
+++ b/how_to_get_the_programming_languages_running_on_your_computer.mdwn
@@ -32,7 +32,7 @@ Furthermore, Mac users will be in one of two subgroups:
     There are instructions about how to get Xcode on the [Installing MacPorts](https://www.macports.org/install.php) page.
     Some versions of [Xcode](http://developer.apple.com/xcode.html) are available for free on the Mac App Store.
     Other versions are available through Apple's Developer website (some of these are free, but do require you to
-    register with Apple as an "Apple Developer", which involves clicking to accept a legal agreement with Apple.)
+    register with Apple as an "Apple Developer", which involves clicking to accept a legal agreement with Apple).
     I have an older version of this installed. If you download a recent version, email me and let me know how the
     process works so I can tell others.
     <!--
@@ -121,7 +121,7 @@ try are
 or [Chibi](https://code.google.com/p/chibi-scheme). The later in that list you go, the more likely it
 is that you'll have to compile the software yourself. (Thus Mac users will need Xcode.)
 
-Racket stands to Scheme in something like the relation Firefox stands to HTML. It's one program among others for working with the language; and many of those programs (or web browsers) permit different extensions, have small variations, and so on.
+Racket stands to Scheme in something like the relation Firefox stands to HTML. It's one program (or platform) among others for working with the Scheme language; and many of those programs (or web browsers) permit different extensions, have small variations, and so on.
 
 Racket has several components. The two most visible components for us are a command-line interpreter named "racket" and a teaching-friendly editor/front-end named "DrRacket". You will probably be working primarily or wholly in the latter.
 <!-- "racket" used to be mzscheme, "DrRacket" used to be DrScheme -->
@@ -150,14 +150,21 @@ The current version of Racket is 6.1.1 (released November 2014).
 
          sudo port install mzscheme
 
+    <!-- mzscheme v4.1.5, from March 2009; latest mzscheme is 4.2.5, from April 2010 -->
+
     If you want the GUI components, I think you'll need to use the
-    "Mac/without MacPorts" installation options above.
+    "Mac/without MacPorts" installation options above. Or you could try the Chicken Scheme implementation instead of Racket. This is more current.
+    To do that, type:
+
+        sudo port install chicken readline
+
+    <!-- chicken v4.8.0.2, from Feb 2013; latest available is 4.9.0.1, from Nov 2014 -->
 
-    I recommend also typing:
+    Whether you use mzscheme or Chicken, I recommend also typing:
 
         sudo port install rlwrap
 
-    then if you ever use the command-line program `mzscheme` (or `racket`), you should start it by typing `rlwrap mzscheme`. This gives
+    then if you ever use the command-line program `mzscheme` (or `racket`, for that matter), you should start it by typing `rlwrap mzscheme` (or whatever). This gives
     you a nice history of the commands you've already typed, which you can scroll up and down in with your
     keyboard arrows.
 
@@ -177,7 +184,7 @@ The current version of Racket is 6.1.1 (released November 2014).
 
         sudo apt-get rlwrap
 
-    then if you ever use the command-line program `mzscheme` (or `racket`), you should start it by typing `rlwrap mzscheme`. This gives
+    then if you ever use the command-line program `mzscheme` (or `racket`), you should start it by typing `rlwrap mzscheme` (or whatever). This gives
     you a nice history of the commands you've already typed, which you can scroll up and down in with your
     keyboard arrows.