* Fixing cmake error on NPA

.travis.yml

@@ -10,14 +10,8 @@ compiler:
 
 before_install:
   # Linux
-#  - if [ ["$TRAVIS_OS_NAME" == "linux"] && ["$CXX" == "g++"] ]; then export CXX="g++-4.8" CC="gcc-4.8"; fi
-  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ trusty main universe"; fi
-#  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get install software-properties-common; fi
-#  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo add-apt-repository -y ppa:george-edison55/cmake-3.x; fi
-#  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get update -qq; fi
-#  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get install --only-upgrade cmake -qq; fi
-  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get install root-system -qq; fi
-#  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get clean; fi
+#  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ trusty main universe"; fi
+#  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then sudo apt-get -qq install root-system; fi
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then cd && wget https://www.dropbox.com/s/8hxjkd6twdsv5fi/geant4_install_new.tar.gz; fi
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then tar -xf geant4_install_new.tar.gz; fi
   - if [ "$TRAVIS_OS_NAME" == "linux" ]; then source ~/geant4_install/share/Geant4-10.1.2/geant4make/geant4make.sh; fi
@@ -47,14 +41,11 @@ branches:
 
 addons:
   apt:
-    sources:
-    - ubuntu-toolchain-r-test
+#    sources:
+#    - ubuntu-toolchain-r-test
     packages:
-#    - gcc-4.8
-#    - g++-4.8
-#    - libexpat1-dev
-#    - libexpat1
     - ninja-build
+    - root-system 
 
 #notifications:
 #  email:

NPLib/ressources/CMake/NPTool_CMake_Preamble.cmake

@@ -49,6 +49,8 @@ elseif(${CMAKE_CXX_FLAGS} MATCHES ".*std=.*0x")
   set(NOCPPFLAGS false) 
 endif()
 
+include(CheckCXXCompilerFlag)
+
 if(NOCPPFLAGS)
   CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
   if(COMPILER_SUPPORTS_CXX11 AND NOT nocpp11)