Not building on OS X 10.9.5

[thehack]

$ make
cc -O2 -Wall -W -Ilua/src `pkg-config --cflags sdl SDL_gfx SDL_image`   -c -o load81.o load81.c
/bin/sh: pkg-config: command not found
In file included from load81.c:37:
./framebuffer.h:4:10: fatal error: 'SDL.h' file not found
#include <SDL.h>
         ^
1 error generated.
make: *** [load81.o] Error 1

[thehack]

To install on OS X:

Install Homebrew

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Install Dependancies

brew install pkg-config sdl SDL_image SDL_gfx

Build the executable

make

[badboy]

/bin/sh: pkg-config: command not found

make sure to have pkg-config installed and properly configured.