Fix travis

Author: dylanmckay

.travis.yml

@@ -1,16 +1,20 @@
 language: cpp
+script: cmake
 
 compiler:
   - clang
 
+matrix:
+  include:
+    - env: CLANG_VERSION=3.7 CPP=11 LIBCXX=On
+      os: linux
+      addons: *clang37
+
 # Attempt to get the right GCC/Clang versions
 before_script:
-  - sudo add-apt-repository -y ppa:kubuntu-ppa/backports
+  - sudo add-apt-repository ppa:kubuntu-ppa/backports -y
   - sudo apt-get update -qq
   - sudo apt-get install cmake
-  - if [ "$CXX" = "clang++" ]; then sudo apt-get install -qq libstdc++-4.8-dev; fi
-  - if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.8; fi
-  - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
   - git clone --depth=1 https://github.com/avr-llvm/clang.git tools/clang
   - git clone --depth=1 https://github.com/avr-llvm/compiler-rt.git projects/compiler-rt