Travis Linux installs glm manually

cmake/travis_install_linux.sh

 #!/bin/bash
 
-sudo apt-get -qq -y install libsdl2-dev libsdl2-ttf-dev libalut-dev libpng12-dev cmake libglm-dev
+sudo apt-get -qq -y install libsdl2-dev libsdl2-ttf-dev libalut-dev libpng12-dev cmake
 
 if [ "$CC" = "gcc" ]; then sudo apt-get install gcc-4.8; fi
 if [ "$CXX" = "g++" ]; then sudo apt-get install g++-4.8; fi
 
 if [ "$CXX" = "clang++" ]; then sudo apt-get install --allow-unauthenticated clang-3.5; fi
 
+wget 'http://downloads.sourceforge.net/project/ogl-math/glm-0.9.6.3/glm-0.9.6.3.zip'
+unzip glm-0.9.6.3.zip
+sudo cp glm/glm /usr/local/include/glm
+