refine language around XCode and gcc versions
diff --git a/src/source/initializing.md b/src/source/initializing.md
index f6cad96..115d842 100644
@@ -137,8 +137,9 @@
## Installing required packages ##
- Install XCode from [the Apple developer site](http://developer.apple.com/).
-We recommend version 3.1.4 or newer. If you are not already registered as an
-Apple developer, you will have to create an Apple ID in order to download.
+We recommend version 3.1.4 or newer, i.e. gcc 4.2.
+If you are not already registered as an Apple developer, you will have to
+create an Apple ID in order to download.
- Install MacPorts from [macports.org](http://www.macports.org/install.php).