Updated Compiling (markdown)

Compiling.md

@@ -40,3 +40,41 @@ NOTE: Unicode support requires a special zlib build - see the end of the zlib en
     Select the desired configuration and build.
     The Release configuration may build significantly slower than Debug.
     Then you can run it.
+
+## GTK
+
+Requirements:
+- GTK 3.20+ or GTK 2.16+ and all dependencies
+- SDL 2.0
+- X11, even if only using Wayland
+- libepoxy
+- meson
+
+Optional:
+- glslang for slang shader support
+- PulseAudio
+- ALSA
+- OSS
+- PortAudio
+- Wayland
+- libpng
+- minizip
+- zlib
+
+Building with meson:
+1. Change to the `gtk` directory and run meson:
+```
+snes9x/gtk$ meson build --prefix=/usr --buildtype=release --strip
+```
+A list of options can be found in `meson_options.txt`. Most will be autodetected. If you wish to use GTK 2 or enable dangerous hacks in the UI, those must be done by supplying the respective option.
+
+2. Build with ninja:
+```
+snes9x/gtk/build$ ninja
+```
+
+3. Install:
+```
+snes9x/gtk/build$ sudo ninja install
+```
+