Need this flag for c++.

diff --git a/buildtools/Cmake/MakeLib.cmake b/buildtools/Cmake/MakeLib.cmake
index c4d1db1..3432d7f 100644 (file)
--- a/buildtools/Cmake/MakeLib.cmake
+++ b/buildtools/Cmake/MakeLib.cmake
@@ -121,6 +121,7 @@ if(HAVE_NS3)
     if(${NS3_VERSION} EQUAL 310)
            SET(SIMGRID_DEP "${SIMGRID_DEP} -lns3")
            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_NS3_3_10")
+           set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_NS3_3_10")
        else(${NS3_VERSION} EQUAL 310)
            SET(SIMGRID_DEP "${SIMGRID_DEP} -lns3-core -lns3-csma -lns3-point-to-point")
        endif(${NS3_VERSION} EQUAL 310)