fix(ci): Disable gcc and install libc++ packages

.travis.yml

@@ -4,7 +4,7 @@ language: cpp
 
 compiler:
   - clang
-  - gcc
+# - gcc
 
 addons:
   apt:
@@ -12,8 +12,8 @@ addons:
       - ubuntu-toolchain-r-test
       - llvm-toolchain-precise-3.8
     packages:
-      - gcc-5
-      - g++-5
+#     - gcc-5
+#     - g++-5
       - clang-3.8
 
 env:
@@ -36,7 +36,7 @@ before_install:
 
   # Install packages : core
   #--------------------------------------------------------------------------x
-  - sudo apt-get install -y cmake cmake-data libcppunit-dev libboost-dev libfreetype6-dev
+  - sudo apt-get install -y libc++-dev libc++abi-dev cmake cmake-data libcppunit-dev libboost-dev libfreetype6-dev
 
   # Install packages : xcb
   #--------------------------------------------------------------------------x
@@ -94,7 +94,7 @@ install:
   # Set compiler's
   #--------------------------------------------------------------------------x
   - if [[ "${CXX}" == "clang++" ]]; then export CXX="clang++-3.8" CC="clang-3.8" CXXFLAGS="${CXXFLAGS} -Qunused-arguments"; fi
-  - if [[ "${CXX}" == "g++" ]]; then export CXX="g++-5" CC="gcc-5"; fi
+# - if [[ "${CXX}" == "g++" ]]; then export CXX="g++-5" CC="gcc-5"; fi
 
 before_script:
   - eval "${CXX} --version"