This article is from the Apple II GNO FAQ, by Devin Reade with numerous contributions by others.
A#9.1: Strictly speaking, all you need is a C compiler (since UNIX source tends to be in C). However, there are a few programs that can be considered "essentials" for doing ports. All of these are mentioned in the section on "Compiling": ORCA/C, occ, dmake
 
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