Full verbose log errors here:
https://pastebin.com/7YDg6KpHAs discussed with a few IRCers, it seems like glext.h is not being referenced properly.
I have installed XCode 4.3.1 and installed its Command Line Tools, and installed 'yaml-cpp', 'sdl', 'sdl_gfx', and 'sdl_mixer' via Homebrew.
I've found glext.h in a few places on OS X...
/System/Library/Frameworks/OpenGL.framework/Headers/glext.h
as well as
/usr/X11/include/glext.h
I've tried referencing these locations explicitly in the makefile but have not had any success.
Thanks in advance for your guidance here - compiling is definitely not my strong suit