It still doesn't work. I added the lines in the Makefile and dropped the libcaelina.a, libGL.a and libGLESv1.a to the ./libs folder. When I try to compile the project now, it gives an error at
#include "GL/gl.h"
source/main.cpp:4 fatal error: GL/gl.h: No such file or directory
EDIT: that's...