Minimal CMake project with OpenGL

CMakeLists.txt

cmake_minimum_required(VERSION 3.9)

# Proeject name - should not contain whitespace 
project(OpengGL_CPP)

#========== Global Configurations =============#
#----------------------------------------------#

# Set the C++ standard for all targets (It sets the flags
# (-std=c++11, -std=c++14 ...) on Clang or GCC. and /std=c++17 on MSVC
# OPTIONAL:
#---------------------------------
set(CMAKE_CXX_STANDARD 17)     
set(CMAKE_VERBOSE_MAKEFILE ON)

#========== Targets Configurations ============#

# Build an executable (Unix-like OSes generates ./openglDemo1, on
# Windows ./opengDemo1.exe)
# ..........................................
add_executable(openglDemo1 opengl1.cpp)

# Set executable dependency libraries
# Equivalent to pass flags -lGL, -lGLU and -lglut 
target_link_libraries(openglDemo1 GL GLU glut)

# Add extension .bin to executable name to make it easier
# to identify that the binary file is an executable.
# So, it turns  openglDemo1 becomes openglDemo1.bin 
if(UNIX)
  set_target_properties(openglDemo1 PROPERTIES SUFFIX ".bin")
endif()

# Add target to run executable 
add_custom_target(run-ex1
    COMMAND openglDemo1 
    DEPENDS openglDemo1 
    WORKING_DIRECTORY ${CMAKE_PROJECT_DIR}
)

opengl1.cpp

#include <iostream>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glut.h>

void renderFunction();

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

	std::cerr << "[INFO] Starting OpenGL main loop." << std::endl;
	
    glutInit(&argc, argv);  
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(500, 500);
    glutCreateWindow("Window 1");
    // Display Callback Function 
    glutDisplayFunc(&renderFunction);
    // Start main loop 
    glutMainLoop();
	std::cerr << "[INFO] Exit OpenGL main loop." << std::endl;
    return 0;
}

void renderFunction(){
	std::cerr << "[INFO] Running loop." << std::endl;
    // Clear the current output buffer
    glClear(GL_COLOR_BUFFER_BIT);   

    // Rotate 10 degrees counterclockwise around z axis
    glRotated(10, 0, 0, 1);

    // Set the current color (RGB) drawing to blue
    glColor3f(0.0, 0.0, 1.0);

    // Start polygon 
    glBegin(GL_POLYGON);
    glVertex3f(-0.5, -0.5, 0);
    glVertex3f( 0.5, -0.5, 0);
    glVertex3f( 0.5,  0.5, 0);
    glVertex3f(-0.5,  0.5, 0);
    // End polygon 
    glEnd();

    glFlush();
}

Thanks! ^^