Install more packages

ci/travis/before_install.sh

@@ -25,7 +25,8 @@ then
     sudo apt-get install -qq -y libxcb1 libxcb1-dev libx11-xcb1 libx11-xcb-dev libxcb-keysyms1 libxcb-keysyms1-dev libxcb-image0 \
             libxcb-image0-dev libxcb-shm0 libxcb-shm0-dev libxcb-icccm4 libxcb-icccm4-dev \
             libxcb-xfixes0-dev libxrender-dev libxcb-shape0-dev libxcb-randr0-dev libxcb-render-util0 \
-            libxcb-render-util0-dev libxcb-glx0-dev libgl1-mesa-dri libegl1-mesa libpcre3-dev \
+            libxcb-render-util0-dev libxcb-glx0-dev libgl1-mesa-dri libegl1-mesa libpcre3 libgles2-mesa-dev \
+            freeglut3-dev libfreetype6-dev xorg-dev xserver-xorg-input-void xserver-xorg-video-dummy xpra libosmesa6-dev \
             curl libdbus-1-dev libdbus-glib-1-dev autoconf automake libtool libgstreamer-plugins-base0.10-0
     wget https://download.qt.io/official_releases/qt/5.5/5.5.1/qt-opensource-linux-x64-5.5.1.run
     chmod +x qt-opensource-linux-x64-5.5.1.run