Thank you all for your contributions.

I managed to figure out how to get "make" onto my OS X machine without installing all those huge files.

For the record, doing so had me, as well as skipping all documentation as recommended, trying to figure out the difference between these optional installation components from the package:

SDK (240 MB)

"This Software Development Kit contains header files, debug and profile libraries, and other resources for developing software using Mac OS X."

Developer Tools (130 MB)

"This package contains applications and tools for developing software using Mac OS X. To use these tools, you must also install the BSD package (from the Mac OS X CD) and the Mac OS X SDK package."

BSD SDK (22 MB)

"This optional package contains additional content for developing in the BSD environment."

I don't know about you, but figuring out which bit would give me "make" wasn't exactly easy.

I went with "Developer Tools" only, which appeared to be correct as I can now "make", "make test" and so on with no problems