Fix travis.yml

.travis.yml

@@ -3,3 +3,13 @@ compiler: gcc
 script:
     - cmake -DCMAKE_BUILD_TYPE=Debug test/ && make
     - ./unit/unit --gtest_filter='*.*'
+
+before_install:
+    #g++4.8.1
+    - if [ "$CXX" == "g++" ]; then sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test; fi
+    - sudo apt-get update -qq
+
+install:
+    # g++4.8.1
+    - if [ "$CXX" = "g++" ]; then sudo apt-get install -qq g++-4.8; fi
+    - if [ "$CXX" = "g++" ]; then export CXX="g++-4.8"; fi