In order to use RSDL you have to install SDL2 library on your system.

1. Install HomeBrew:

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

2. Install SDL with HomeBrew:

brew install sdl2
brew install sdl2_image
brew install sdl2_ttf

3. Ensure that following libraries are included in rsdl.hpp:

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_ttf.h>

4. To compile rsdl.cpp, you have to compile it with -l option to include SDL2, SDL2_image and SDL2_ttf libraries.Run the following command:

g++ [your cpp files] rsdl.cpp -l SDL2 -l SDL2_image -l SDL2_ttf

1. Download the latest SDL2 development library dmg file from the SDL website (currently latest version is 2.0.6)

2. Download SDL2_image development library from this page

3. Download SDL2_ttf development library from this page

4. Now open these dmg files and copy SDL2.framework,SDL2_ttf.framework and SDL2_image.framework files to /Library/Frameworks

5. Replace SDL libraries inclusion in rsdl.hpp with following ones:

#include <SDL2/SDL.h>
#include <SDL2_image/SDL_image.h>
#include <SDL2_ttf/SDL_ttf.h>

6. To compile rsdl.cpp, you have to compile it with -framework option to include SDL2, SDL2_image and SDL2_ttf libraries. Run the following command:

g++ [your cpp files] rsdl.cpp -framework SDL2 -framework SDL2_image -framework SDL2_ttf

1. Make sure you have the following apt-get repo:‍ http://us.archive.ubuntu.com/ubuntu and your apt-get packages list is up to date.

   1. Open your repos list with the following command:

   sudo nano /etc/apt/sources.list

   2. Ensure that following line exists in the file, if it does not exists, add it to the file:

   deb http://us.archive.ubuntu.com/ubuntu trusty main universe

   3. Update your apt-get packages list:

   sudo apt-get update

2. Run command below to install SDL2, SDL2_image and SDL2_ttf packages

sudo apt-get install libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev 

3. Ensure that following libraries are included in rsdl.hpp:

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_ttf.h>

4. To compile rsdl.cpp, you have to compile it with -l option to include SDL2, SDL2_image and SDL2_ttf libraries.Run the following command:

g++ [your cpp files] rsdl.cpp -l SDL2 -l SDL2_image -l SDL2_ttf

To test your installation download or clone the repository (from this link) and go into the downloaded directory, then run the make command to build the test file.
Finally running ./test.out should come up with a window with UT background. ./examle.out is another example.

cd RSDL   
make    
./test.out
./example.out