Try to fix Travis part 4

.travis.yml

@@ -2,12 +2,17 @@ language: python
 
 python:
   - 2.7
-compiler: clang
   
-env:
-  - CXX=clang++
+compiler: gcc
 
 before_install:
+  - sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
+  - sudo apt-get -qq update
+  - sudo apt-get -qq install g++-4.8 libstdc++-4.8-dev
+  - sudo update-alternatives --quiet --install /usr/bin/gcc  gcc  /usr/bin/gcc-4.8  60
+                                     --slave   /usr/bin/g++  g++  /usr/bin/g++-4.8
+                                     --slave   /usr/bin/gcov gcov /usr/bin/gcov-4.8
+  - sudo update-alternatives --quiet --set gcc /usr/bin/gcc-4.8
   - "curl -L https://gist.github.com/jparyani/6216515/raw/a50cb02574033a14f3856dac949f83b4c0557c82/install_capnproto.sh | /bin/bash"
 
 install: