Fix Travis

.travis.yml

@@ -4,11 +4,11 @@ compiler:
 before_install:
  - sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
  - sudo apt-get -qq update
- - sudo apt-get -qq install g++-4.8 xorg-dev libglu1-mesa-dev libglew-dev libxcursor-dev
+ - sudo apt-get -qq install g++-4.8 xorg-dev libglu1-mesa-dev libglew-dev libxcursor-dev libglew-dev
  - sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.8 90
  - git clone https://github.com/glfw/glfw.git
  - "mkdir glfw/build && cd glfw/build && cmake .. && make && sudo make install ; cd -"
 script:
  - mkdir build && cd build
  - cmake ..
- - make -j4
\ No newline at end of file
+ - make -j4