editline/history.h and editline/readline.h not found/working on OSX when trying to compile with developer tools installed already

Question

I am working on this tutorial on building your own LISP (http://www.buildyourownlisp.com/chapter4_interactive_prompt) and for some reason when I try to compile I get this:

Answer 1

Include only

#include 

which should exist if the command line tools are installed. This file contains the "readline wrapper" for libedit, including the history functions as well. An include file does not exist on OS X.

I tested your code with that modification, and it compiled and ran without problems.