hello,
I'm trying to follow this tutorial https://learnopengl.com/Getting-started/Hello-Triangle

With allegro 5 as a framework. I did include #include <allegro5/allegro_opengl.h>
but still a lot of openGL stuff is not found

||=== Build: Release in OpenGL_Demo (compiler: GNU GCC Compiler) ===|
D:\Development\Code\OpenGL_Alleg\CustomProgram.cpp||In constructor 'CustomProgram::CustomProgram(int, int, bool)':|
D:\Development\Code\OpenGL_Alleg\CustomProgram.cpp|50|error: 'glGenBuffers' was not declared in this scope|
D:\Development\Code\OpenGL_Alleg\CustomProgram.cpp|51|error: 'GL_ARRAY_BUFFER' was not declared in this scope|
D:\Development\Code\OpenGL_Alleg\CustomProgram.cpp|51|error: 'glBindBuffer' was not declared in this scope|
D:\Development\Code\OpenGL_Alleg\CustomProgram.cpp|52|error: 'GL_STATIC_DRAW' was not declared in this scope|
D:\Development\Code\OpenGL_Alleg\CustomProgram.cpp|52|error: 'glBufferData' was not declared in this scope|
D:\Development\Code\OpenGL_Alleg\A5Program.cpp||In constructor 'A5Program::A5Program(int, int, bool, bool)':|
D:\Development\Code\OpenGL_Alleg\A5Program.cpp|96|warning: unused variable 'm_nWidth' [-Wunused-variable]|
D:\Development\Code\OpenGL_Alleg\A5Program.cpp|97|warning: unused variable 'm_nHeight' [-Wunused-variable]|
||=== Build finished: 5 error(s), 2 warning(s) (0 minute(s), 0 second(s)) ===|

Any tips on how to set it up correctly >
I attached my project so you can see what I'm trying to do

Windows OpenGL headers only expose 1.1. To get extensions, you need to use something custom like GLEW, or al_get_opengl_proc_address.

I tought Allegro would already take care of that, since it uses OpenGL itself...

Annyway what would be the easiest way to do it ?
I tried to compile with glew once bu I gave up after getting a lot of undefined references

Undefined references are caused by not linking to the correct libraries. If you want to be a good programmer, you're going to have to learn how to link properly. Link or swim.

Extensions are not defined because they're extensions. Read the manual link I posted that tells you exactly how to define an extension pointer and call it.

https://www.opengl.org/discussion_boards/showthread.php/172481-glGenBuffer-was-not-declared

Your project wasn't linking opengl so even if it compiled, it would still give undefined references. -lglu32 -lopengl32

Allegro already loads all the extensions (i.e. it does the same thing GLEW does already). If some newer extension is missing from Allegro we should add it. It also might make sense to replace Allegro's extension code with GLEW (as a new dependency for Allegro) since they are probably doing a better job. (If we can do so without breaking old Allegro code at least.)

I discovered something with gdb today. If you do 'info variables', it will print out EVERY variable in existence. That means every single global defined in any file anywhere.

If you do 'info variables glGenBuffer' inside gdb while running an allegro program, you get this back :

(gdb) info variables glGenBuffer
All variables matching regular expression "glGenBuffer":

File E:/LIBS/LIBS81Build/allegro5/include/allegro5/opengl/GLext/gl_ext_api.h:
_ALLEGRO_glGenBuffers_t _al_glGenBuffers;
_ALLEGRO_glGenBuffersARB_t _al_glGenBuffersARB;
(gdb)

So allegro 5 knows about glGenBuffer, it's just hiding it from you.