As we have said, Apple bundles development tools along with the Mac OS X operating system. However, these tools are often an optional part of the installation process, and all the necessary components might not yet be installed on your system. If your copy of Mac OS X came pre-installed on a new Macintosh, these tools may be installed already. Otherwise, you need to install the necessary pieces from your Mac OS X CDs.
In Mac OS X 10.4 "Tiger," developer tools are spread across two different installer packages. The first package, BSD, contains a collection of command-line tools that may be useful when writing programs on Mac OS X. If you followed along with Chapter 1, you already have this package installed. If you skipped this part of Chapter 1, find your Mac OS X installation CDs and install them now. Just run the main installer, click the Configure button in the lower-left corner, and select the BSD package.