devel/SDL2 on Mac OS X 10.15.x (Darwin 19.4.x)

[Paul Ripke <stix%stix.id.au@localhost>]

Anyone successfully built SDL2 on Mac OS X 10.15.x (Darwin 19.4.x)? I had
a quick look around for these symbols and came up empty.

2020-04-07-10:31:33:   CC     build/SDL_test_memory.lo
2020-04-07-10:31:33:   CC     build/SDL_test_random.lo
2020-04-07-10:31:33:   LTLINK build/libSDL2.la
2020-04-07-10:31:34:   LTLINK build/libSDL2main.la
2020-04-07-10:31:35:   LTLINK build/libSDL2_test.la
2020-04-07-10:31:38: Undefined symbols for architecture x86_64:
2020-04-07-10:31:38:   "_Cocoa_IsWindowInFullscreenSpace", referenced from:
2020-04-07-10:31:38:       _SDL_UpdateFullscreenMode in SDL_video.o
2020-04-07-10:31:38:       _SDL_OnWindowFocusLost in SDL_video.o
2020-04-07-10:31:38:   "_Cocoa_SetWindowFullscreenSpace", referenced from:
2020-04-07-10:31:38:       _SDL_UpdateFullscreenMode in SDL_video.o
2020-04-07-10:31:38: ld: symbol(s) not found for architecture x86_64
2020-04-07-10:31:38: clang: error: linker command failed with exit code 1 (use -v to see invocation)
2020-04-07-10:31:38: gnumake: *** [build/libSDL2.la] Error 1

-- 
Paul Ripke
"Great minds discuss ideas, average minds discuss events, small minds
 discuss people."
-- Disputed: Often attributed to Eleanor Roosevelt. 1948.