"SDL.h" not found

[Lee-Garcon]

I got an error from running make while following the install steps:

[ 51%] Building C object opl/CMakeFiles/opl.dir/opl.c.o
/Users/dylanwallace/chocolate-doom/opl/opl.c:23:10: fatal error: 'SDL.h' file not found
#include "SDL.h"
         ^~~~~~~
1 error generated.
make[3]: *** [opl/CMakeFiles/opl.dir/opl.c.o] Error 1
make[2]: *** [opl/CMakeFiles/opl.dir/all] Error 2
make[1]: *** [src/CMakeFiles/chocolate-doom.dir/rule] Error 2
make: *** [chocolate-doom] Error 2

Anything helps!

[limitedeternity]

Look here