diff --git a/.travis.yml b/.travis.yml
index bdd280b..deb270e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +1,8 @@
 ## Documentation: http://docs.travis-ci.com/user/languages/julia/
 language: julia
 os:
+# - osx
   - linux
-  - osx
 julia:
   - 0.7
   - 1.0
@@ -18,14 +18,32 @@ matrix:
   allow_failures:
   - julia: nightly
 
-## uncomment and modify the following lines to manually install system packages
-#addons:
-#  apt: # apt-get for linux
-#    packages:
-#    - gfortran
-#before_script: # homebrew for mac
-#  - if [ $TRAVIS_OS_NAME = osx ]; then brew install gcc; fi
+addons:
+  apt: # apt-get for linux
+    sources:
+      - ubuntu-toolchain-r-test
+    packages:
+    - g++-4.9
+    - cmake
+    - libboost-all-dev
+    - build-essential
+    - zlib1g-dev
+    - libsdl2-dev
+    - libjpeg-dev
+    - nasm
+    - tar
+    - libbz2-dev
+    - libgtk2.0-dev
+    - git
+    - libfluidsynth-dev
+    - libgme-dev
+    - libopenal-dev
+    - timidity
+    - libwildmidi-dev
+    - unzip
 
+env:
+  - CC=gcc-4.9 && CXX=g++-4.9
 ## uncomment the following lines to override the default test script
 #script:
 #  - julia -e 'Pkg.clone(pwd()); Pkg.build("ReinforcementLearningEnvironmentVizDoom"); Pkg.test("ReinforcementLearningEnvironmentVizDoom"; coverage=true)'