Build error using clang++ -std=c++11

On FreeBSD using clang++ v5.0 with -std=c++11 I am getting a build error -
error: no matching constructor for initialization of 'std::vector<Animation *>'

/usr/bin/c++  -DGENERATEDSAXPARSER_XMLPARSER_LIBXML -DOpenCOLLADAStreamWriter_shared_EXPORTS -DXMLPARSER_LIBXML 
-I/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/COLLADAStreamWriter/include 
-I/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/COLLADABaseUtils/include 
-I/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/COLLADABaseUtils/include/Math 
-I/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/common/libftoa/include 
-I/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/common/libBuffer/include 
-I/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/Externals/UTF/include -O2 -pipe  
-I//usr/local/include -fstack-protector -fno-strict-aliasing  -std=c++11  -O2 -pipe  
-I//usr/local/include -fstack-protector -fno-strict-aliasing  -std=c++11 -fPIC -MD
-MT COLLADAStreamWriter/CMakeFiles/OpenCOLLADAStreamWriter_shared.dir/src/COLLADASWLibraryAnimations.cpp.o
-MF COLLADAStreamWriter/CMakeFiles/OpenCOLLADAStreamWriter_shared.dir/src/COLLADASWLibraryAnimations.cpp.o.d -o 
COLLADAStreamWriter/CMakeFiles/OpenCOLLADAStreamWriter_shared.dir/src/COLLADASWLibraryAnimations.cpp.o -c 
/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/COLLADAStreamWriter/src/COLLADASWLibraryAnimations.cpp
/usr/ports/graphics/opencollada/work/OpenCOLLADA-1.6.61/COLLADAStreamWriter/src/COLLADASWLibraryAnimations.cpp:65:79: 
error: no matching constructor for initialization of 'std::vector<Animation *>'
            : Library ( streamWriter, CSWC::CSW_ELEMENT_LIBRARY_ANIMATIONS ), mOpenAnimations ( NULL )
                                                                              ^                 ~~~~
 /usr/include/c++/v1/vector:479:40: note: candidate constructor not viable: no known conversion from 'nullptr_t' to 'const std::__1::vector<COLLADASW::Animation *, std::__1::allocator<COLLADASW::Animation *> >::allocator_type' (aka 'const std::__1::allocator<COLLADASW::Animation *>') for 1st argument
    _LIBCPP_INLINE_VISIBILITY explicit vector(const allocator_type& __a)
                                       ^
/usr/include/c++/v1/vector:491:14: note: candidate constructor not viable: no known conversion from 'nullptr_t' to 'std::__1::vector<COLLADASW::Animation *, std::__1::allocator<COLLADASW::Animation *> >::size_type' (aka 'unsigned long') for 1st argument
    explicit vector(size_type __n);
             ^
/usr/include/c++/v1/vector:534:5: note: candidate constructor not viable: no known conversion from 'nullptr_t' to 'const std::__1::vector<COLLADASW::Animation *, std::__1::allocator<COLLADASW::Animation *> >' for 1st argument
    vector(const vector& __x);
    ^
/usr/include/c++/v1/vector:541:5: note: candidate constructor not viable: no known conversion from 'nullptr_t' to 'initializer_list<std::__1::vector<COLLADASW::Animation *, std::__1::allocator<COLLADASW::Animation *> >::value_type>' (aka 'initializer_list<COLLADASW::Animation *>') for 1st argument
    vector(initializer_list<value_type> __il);
    ^
/usr/include/c++/v1/vector:547:5: note: candidate constructor not viable: no known conversion from 'nullptr_t' to 'std::__1::vector<COLLADASW::Animation *, std::__1::allocator<COLLADASW::Animation *> >' for 1st argument
    vector(vector&& __x)
    ^

I am actually test building with pre-releases of clang v6.0 which has defaults set to using -std=c++14 but I'm getting the same error with clang 5.0 using -std=c++11 and -std=c++0x

Changing NULL to 0 compiles, but is mOpenAnimations ( 0 ) a reasonable change? or is there a better option.

Start at COLLADAStreamWriter/src/COLLADASWLibraryAnimations.cpp around line 65 and inspect the mOpenAnimations initializer. Reproduce the reported FreeBSD clang++ C++11 build, then verify the selected change builds successfully without introducing errors under the reported standards.