text: #ifndef PWX_GRAVMAT_MAIN_H
  #define PWX_GRAVMAT_MAIN_H 1
  
  #include <SFML/Graphics.hpp>
  
  #include <cstdlib>
  #include <climits>
  #include <cstring>
  #include <iostream>
  using std::cout;
  using std::cerr;
  using std::endl;
  
  #include <cmath>
  
  #include "environment.h"
  
  #endif // PWX_GRAVMAT_MAIN_H
  