another try

.travis.yml

@@ -51,6 +51,7 @@ matrix:
         - LLVM_ARCHIVE_PATH=$HOME/clang+llvm.tar.xz
         - COMPILER=$HOME/clang-$LLVM_VERSION/bin/clang++
         - CPPFLAGS="-I $HOME/clang-$LLVM_VERSION/include/c++/v1"
+        - CXXFLAGS=-lc++
       before_install:
        - wget http://llvm.org/releases/$LLVM_VERSION/clang+llvm-$LLVM_VERSION-x86_64-linux-gnu-ubuntu-14.04.tar.xz -O $LLVM_ARCHIVE_PATH
        - mkdir $HOME/clang-$LLVM_VERSION
@@ -102,37 +103,51 @@ matrix:
     - os: osx
       osx_image: beta-xcode6.1
       compiler: clang
-      env: COMPILER=clang
+      env:
+       - COMPILER=clang
+       - CXXFLAGS=-lstdc++
 
     - os: osx
       osx_image: beta-xcode6.2
       compiler: clang
-      env: COMPILER=clang
+      env:
+       - COMPILER=clang
+       - CXXFLAGS=-lstdc++
 
     - os: osx
       osx_image: beta-xcode6.3
       compiler: clang
-      env: COMPILER=clang
+      env:
+       - COMPILER=clang
+       - CXXFLAGS=-lstdc++
 
     - os: osx
       osx_image: xcode6.4
       compiler: clang
-      env: COMPILER=clang
+      env:
+       - COMPILER=clang
+       - CXXFLAGS=-lstdc++
 
     - os: osx
       osx_image: xcode7.1
       compiler: clang
-      env: COMPILER=clang
+      env:
+       - COMPILER=clang
+       - CXXFLAGS=-lstdc++
      
     - os: osx
       osx_image: xcode7.2
       compiler: clang
-      env: COMPILER=clang
+      env:
+       - COMPILER=clang
+       - CXXFLAGS=-lstdc++
 
     - os: osx
       osx_image: xcode7.3
       compiler: clang
-      env: COMPILER=clang
+      env:
+       - COMPILER=clang
+       - CXXFLAGS=-lstdc++
 
 script:
   - uname -a