Add sdl2

SDL2 on Rpi without X11.html

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+<div>
+<div>
+<p>If you want to do graphical applications with SDL2 on a rapsberry pi
+without the overhead of X11, you will need to compile SDL2 yourself. I'll
+assume you are running raspian.</p>
+
+<p>Install required libraries to build</p>
+
+<blockquote class="code-block">sudo apt-get install libdrm-dev libgdm-dev</blockquote>
+
+<p>Next download a SDL2 source tarball. They can be found <a
+href="https://www.libsdl.org/download-2.0.php">here</a>.
+Next, change to the directory of the unzipped tarball and run the following.</p>
+
+<blockquote class="code-block">./configure --enable-video=kmsdrm
+    make -j4
+    sudo make install
+</blockquote>
+
+<p>To check if the library was compiled sucessfully, compile <a
+href="https://pastebin.com/raw/5gQXZ2mZ">this</a>
+piece of code. You should see the screen flashing, as well as your desired
+graphics driver on stdout. To compile,</p>
+
+<blockquote class="code-block">g++ ./test_prog.cpp `pkg-config --cflags --libs sdl2`
+</blockquote>
+
+<p>You can change the driver used via raspi-config if opengl es is not
+desired.</p>
+
+<p>I hope this helped someone, happy embedded programming!</p>
+
+</div>
+</div>