Link: Introduction to Porting UNIX/Linux Applications to (15 Oct 2007)

The UNIX Porting Guide is a first stop for UNIX developers coming to Mac OS X. This document helps guide developers in bringing applications written for UNIX-based operating systems to Mac OS X. It provides the background needed to understand the operating system. It touches on some of the design decisions, and it provides a listing and discussion of some of the main areas that you should be concerned with in bringing UNIX applications to Mac OS X. It also points out some of the advanced fe