Building on linux

Download/install the following libraries/tools:
- Install CMake (>= 3.4, binary or source from https://cmake.org/download/)
- Install FreeType(2.6.5, http://download.savannah.gnu.org/releases/freetype/freetype-2.6.5.tar.gz)
- Install libogg (from package manager or http://downloads.xiph.org/releases/ogg/libogg-1.3.2.tar.gz )
- Install libvorbis (from package manager or http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.5.tar.gz )
- Install SDL2 (2.0.4, https://www.libsdl.org/release/SDL2-2.0.4.tar.gz )
- Install zlib (from package manager or http://zlib.net/zlib-1.2.8.tar.gz )
- Install libPNG (1.6, http://download.sourceforge.net/libpng/libpng-1.6.24.tar.gz )
- Install libjpeg (9b, http://ijg.org/files/jpegsrc.v9b.tar.gz )
- Get libgl1-mesa-dev (from package manager)

(Versions/Links listed are the ones used for a working build on my machine)