Having problems with Code::Blocks while setting up SFML static library - build

Question

First of all, I have to say that I'm only a beginner with c++ programming so it's the first time ever I try to set up sfml 2.4.0. I'm running Code::Blocks on Ubuntu 16.04 LTS. The script with the error is the same as the tutorial on SFML's official site:
#include <iostream>
#include <SFML/Graphics.hpp>
#include <SFML/Window.hpp>
#include <SFML/System.hpp>
using namespace std;
int main()
{
sf::RenderWindow finestra (sf::VideoMode(100,100), "Ciao!");
sf::CircleShape cerchio (100.f);
cerchio.setFillColor(sf::Color::Blue);
while (finestra.isOpen())
{
sf::Event evento;
while (finestra.pollEvent(evento))
{
if (evento.type == sf::Event::Closed)
finestra.close();
}
finestra.clear();
finestra.draw(cerchio);
finestra.display();
}
return 0;
}
Don't mind for strange names to variables and strings, I just wanted to get more familiar with the script using terms of my language.
The error appearing after I tried to build and run the script is this ("riferimento non definito a" means "undefined reference to"):
||=== Build: Debug in primo_game_magari_serio (compiler: GNU GCC Compiler) ===|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|106|riferimento non definito a "glClearColor"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|107|riferimento non definito a "glClear"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|276|riferimento non definito a "glVertexPointer"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|277|riferimento non definito a "glColorPointer"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|278|riferimento non definito a "glTexCoordPointer"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|287|riferimento non definito a "glDrawArrays"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|311|riferimento non definito a "glGetError"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|321|riferimento non definito a "glPushClientAttrib"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|322|riferimento non definito a "glPushAttrib"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|324|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|325|riferimento non definito a "glPushMatrix"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|326|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|327|riferimento non definito a "glPushMatrix"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|328|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|329|riferimento non definito a "glPushMatrix"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|341|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|342|riferimento non definito a "glPopMatrix"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|343|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|344|riferimento non definito a "glPopMatrix"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|345|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|346|riferimento non definito a "glPopMatrix"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|348|riferimento non definito a "glPopClientAttrib"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|349|riferimento non definito a "glPopAttrib"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|374|riferimento non definito a "glDisable"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|375|riferimento non definito a "glDisable"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|376|riferimento non definito a "glDisable"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|377|riferimento non definito a "glDisable"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|378|riferimento non definito a "glEnable"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|379|riferimento non definito a "glEnable"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|380|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|381|riferimento non definito a "glEnableClientState"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|382|riferimento non definito a "glEnableClientState"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|383|riferimento non definito a "glEnableClientState"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|419|riferimento non definito a "glViewport"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|422|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|423|riferimento non definito a "glLoadMatrixf"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|426|riferimento non definito a "glMatrixMode"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|444|riferimento non definito a "glBlendFunc"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/RenderTarget.cpp|485|riferimento non definito a "glLoadMatrixf"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Shader.cpp|64|riferimento non definito a "glGetIntegerv"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Shader.cpp|984|riferimento non definito a "glFlush"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|66|riferimento non definito a "glGetIntegerv"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|72|riferimento non definito a "glGetIntegerv"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|124|riferimento non definito a "glDeleteTextures"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|166|riferimento non definito a "glGenTextures"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|214|riferimento non definito a "glBindTexture"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|215|riferimento non definito a "glTexImage2D"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|216|riferimento non definito a "glTexParameteri"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|217|riferimento non definito a "glTexParameteri"|
/usr/local/share/buildslave/tmp/build/src/SFML/Graphics/Texture.cpp|218|riferimento non definito a "glTexParameteri"|
||More errors follow but not being shown.|
||Edit the max errors limit in compiler options...|
||=== Build failed: 50 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|
Here there are the project's build option (the ones I don't mention are set to default):
Search Directories/Compiler: /home/user/Downloads/SFML-2.4.0/include
Search Directories/Linker: /home/user/Downloads/SFML-2.4.0/lib (I also tried to add another "/include" but it didn't work too)
Linker Settings/Debug/sfml-graphics-s-d
sfml-window-s-d
sfml-system-s-d
Linker Settings/Release/sfml-graphics-s
sfml-window-s
sfml-system-s
Compiler Settings/#defines/SFML_STATIC
I searched for over a week in very single thread like these on the forum, but I never found the same problem as mine. If you need other information just ask, thank you in advance.

Answer 1

The undefined references are to opengl. You will need to add the opengl library.
In windows that would be opengl32, added after all the sfml libraries
In linux, I am not so certain, but it looks like GL
( It is strange that the SFML docs do not mention this. The windows version at https://www.sfml-dev.org/tutorials/2.4/start-cb.php does mention the dependency, but the screenshot does not show the library reference. The linux build instructions do not mention it at all! When you get this working, you should ask them to updated the docs. )