* Adding clang to travis

.travis.yml

@@ -2,6 +2,7 @@ language: cpp
 
 compiler:
   - gcc
+  - clang
 
 before_install:
   - sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ trusty main universe"

NPLib/CMakeLists.txt

@@ -39,6 +39,9 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${root_cflags}")
 # If the compiler is Clang, silence the unrecognised flags
 if(${CMAKE_CXX_COMPILER_ID} MATCHES ".*Clang.*")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Qunused-arguments -fcolor-diagnostics")
+  if( UNIX AND NOT APPLE )
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+  endif()
 endif()
 
 set(CMAKE_BINARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin )