Hi:

I've some experience programming on high-level (C#, java) and I thought it was time to learn some low-level stuff. I'm trying to make a test program using c++, opengl and make.

My .cpp is very simple:

Code:
#include <iostream>
#include <GL/glew.h>
#include <GL/glut.h>

void render();

int main(int argc, char** args){


	int exitCode = 0;

	
	glutInit(&argc, args);
	glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
	glutInitWindowPosition(100, 100);
	glutInitWindowSize(640,480);
	glutCreateWindow("Hi again");

	glutDisplayFunc(render);

	glutMainLoop();

	return exitCode;
}

void render (void){

}
And also I have coded a simple make file:

Code:
testings:  testings.o
	   g++ testings.o -o testings -lglut

testings.o: testings.cpp
	    g++ -c -Wall testings.cpp
I can compile my program from terminal running:

Code:
g++ -c -Wall testings.cpp
g++ testings.o -o testings -lglut
An it runs at expected (creates a window, and doesn't refresh the contents of it). But if when I use:

Code:
make testings
I get:

Code:
g++     testings.cpp   -o testings
/tmp/ccAjW2UV.o:testings.cpp:function main: error: undefined reference to 'glutInit'
/tmp/ccAjW2UV.o:testings.cpp:function main: error: undefined reference to 'glutInitDisplayMode'
/tmp/ccAjW2UV.o:testings.cpp:function main: error: undefined reference to 'glutInitWindowPosition'
/tmp/ccAjW2UV.o:testings.cpp:function main: error: undefined reference to 'glutInitWindowSize'
/tmp/ccAjW2UV.o:testings.cpp:function main: error: undefined reference to 'glutCreateWindow'
/tmp/ccAjW2UV.o:testings.cpp:function main: error: undefined reference to 'glutDisplayFunc'
/tmp/ccAjW2UV.o:testings.cpp:function main: error: undefined reference to 'glutMainLoop'
collect2: error: ld returned 1 exit status
make: *** [testings] Error 1
From the little I know, this means the compiler is missing some links, but the link I've provided are the same for the terminal and the makefile (-lglut). I don't believe it's because it's missing a library, because I've installed:

libglew1.8
glew-utils
libglew-dev
freeglut3
freeglut3-dev.

I've have the feeling that it's probably my mistake in some subtlety the makefile, but hours have passed and I can't find the error (I'ts almost 4 am here).

That's it, thank you for reading this far an let's hope it's just a little thingy