finished the guide

Working-on-Chrome-OS.md

@@ -12,3 +12,92 @@ Optionally, you could use **CMake** building system.
 
     sudo apt install cmake
 
+#### Install required libraries
+For raylib to compile, you will need some additional libraries installed
+    sudo apt install mesa-common-dev libx11-dev libgl1-mesa-dev
+
+### Build raylib using make
+You can compile three different types of raylib library:
+
+* The static library (default method)
+* The dynamic shared library (often used on Linux)
+* The web library
+
+Download the raylib repository from [Github](https://github.com/raysan5/raylib), then compile it with:
+
+    git clone https://github.com/raysan5/raylib.git raylib
+    cd raylib/src/
+    make PLATFORM=PLATFORM_DESKTOP # To make the static version.
+    make PLATFORM=PLATFORM_DESKTOP RAYLIB_LIBTYPE=SHARED # To make the dynamic shared version.
+    make PLATFORM=PLATFORM_WEB # To make web version.
+
+**Warning:** if you want to compile a different type of library (static, ...), you must type `make clean` before the compiling.
+
+Install the library to the standard directories, `usr/local/lib` and `/usr/local/include`, or remove it:
+
+    sudo make install # Static version.
+    sudo make install RAYLIB_LIBTYPE=SHARED # Dynamic shared version.
+    
+    sudo make uninstall
+    sudo make uninstall RAYLIB_LIBTYPE=SHARED
+
+_NOTE:_ raylib is configurable and can be be built in a variety of ways. Please read [`src/Makefile`](https://github.com/raysan5/raylib/blob/master/src/Makefile), [`src/config.h`](https://github.com/raysan5/raylib/blob/master/src/config.h) and [`raylib.h`](https://github.com/raysan5/raylib/blob/master/src/raylib.h) itself for a full listing of available options and values.
+
+### Build raylib using CMake
+
+Building with cmake on Linux is easy, just use the following:
+```
+git clone https://github.com/raysan5/raylib.git raylib
+cd raylib
+mkdir build && cd build
+cmake -DBUILD_SHARED_LIBS=ON ..
+make
+sudo make install
+```
+In case any dependencies are missing, cmake will tell you.
+
+_NOTE:_ raylib is configurable and can be be built in a variety of ways. See the [CMake Build Options](https://github.com/raysan5/raylib/wiki/CMake-Build-Options) for a full listing of available options and values. Alternatively, you may use the curses UI provided by `ccmake(1)` for interactively configuring raylib.
+
+## Building Examples
+
+If you have installed raylib with `make install`, Just move to the folder `raylib/examples` and run:
+
+    make PLATFORM=PLATFORM_DESKTOP
+
+If raylib was installed with `make install RAYLIB_LIBTYPE=SHARED`
+
+    make PLATFORM=PLATFORM_DESKTOP RAYLIB_LIBTYPE=SHARED
+
+A more detailed command for the OpenGL ES GRAPHICS variant on Ubuntu 16.04 is:
+
+    make  PLATFORM=PLATFORM_DESKTOP  GRAPHICS=GRAPHICS_API_OPENGLES_20 RAYLIB_LIBTYPE=SHARED USE_EXTERNAL_GLFW=TRUE \
+        CFLAGS="-fPIC -I/usr/include/GL" LDFLAGS='-L/usr/local/lib/raysan5 -lGLESv2 -lglfw3'
+    
+To compile just one specific example, add flags as needed:
+
+    make core/core_basic_window PLATFORM=PLATFORM_DESKTOP
+
+To force recompile one example:
+
+    make core/core_basic_window PLATFORM=PLATFORM_DESKTOP -B
+
+The `raylib/games` folder can be made the same way as the examples. Have fun!
+
+
+### Link raylib with system GLFW
+
+Instead of using the embedded GLFW, you can download GLFW3 and build it from source (it requires CMake).
+
+    wget https://github.com/glfw/glfw/releases/download/3.2.1/glfw-3.2.1.zip
+    unzip glfw-3.2.1.zip
+    cd glfw-3.2.1
+    cmake -DBUILD_SHARED_LIBS=ON
+    sudo make install
+
+Now with GLFW installed, you may build raylib while specifying `USE_EXTERNAL_GLFW`:
+
+```
+make USE_EXTERNAL_GLFW=TRUE
+# or
+cmake -DUSE_EXTERNAL_GLFW=ON
+```