[x86] ~/Desktop/gnukem> make
g++ -Wall -Wno-switch -DDEBUG -I/usr/include/SDL -I/usr/local/include/SDL -c src/sdl/djgraph.cpp -o src/sdl/djgraph.o
In file included from src/sdl/djgraph.cpp:16:
src/sdl/../djgraph.h:12:10: fatal error: SDL.h: No such file or directory
 #include "SDL.h"
          ^~~~~~~
compilation terminated.
Makefile:101: recipe for target 'src/sdl/djgraph.o' failed
make: *** [src/sdl/djgraph.o] Error 1
[x86] ~/Desktop/gnukem>