README.md: Add installation instructions for Gentoo
@@ -25,6 +25,9 @@ On __Fedora 20 and above__, type:
On __Arch Linux__, type:
`pacman -S sdl2{,_mixer,_image,_ttf}`
+On __Gentoo__, type:
+`emerge -av libsdl2 sdl2-{gfx,image,mixer,ttf}`
+
On __Mac OS X__, install SDL2 via [Homebrew](http://brew.sh) like so:
`brew install sdl2{,_image,_ttf,_mixer} pkg-config`
