Workaround for missing libsdl2-dev

.travis.yml

@@ -5,6 +5,16 @@ dist: xenial
 before_install:
   - sudo apt-get update
   - sudo apt-get -y install autotools-dev audacious-dev libglib2.0-dev
+install:
+  - cd ~
+  - mkdir sdl2install
+  - export SDL2DIR="`pwd`/sdl2install"
+  - wget https://www.libsdl.org/release/SDL2-2.0.3.tar.gz
+  - tar xzf SDL2-2.0.3.tar.gz
+  - cd SDL2-2.0.3
+  - ./configure --prefix=$SDL2DIR
+  - make
+  - make install
 script: 
   - ./autogen.sh
   - make