Error with make command

[splitface2811]

First off let me say that I'm a linux noob.

I downloaded the zip of the program, extracted the contents and navigated to the directory. Then I ran make

gcc -g -Wall -c dvorak.c -o dvorak.o
dvorak.c:66:10: fatal error: stdlib.h: No such file or directory
 #include <stdlib.h>
          ^~~~~~~~~~
compilation terminated.
Makefile:15: recipe for target 'dvorak.o' failed
make: *** [dvorak.o] Error 1

That is the output that I got. I'm probably doing something wrong with this command.