Errors trying to use libc++ with Clang 3.1 in Mac OSX 10.6 (Snow Leopard)

libc++ & Clang

$ make
[100%] Building CXX object CMakeFiles/foo.dir/foo.cpp.o
In file included from /Users/xxxxx/fantom/bin/foo/foo.cpp:1:
In file included from /Users/xxxxx/fantom/include/fantom/algorithm.hpp:10:
In file included from /usr/include/c++/v1/unordered_map:318:
In file included from /usr/include/c++/v1/__hash_table:19:
/usr/include/c++/v1/cmath:1333:9: error: no member named 'llrint' in the global namespace
using ::llrint;
      ~~^
/usr/include/c++/v1/cmath:1334:9: error: no member named 'llrintf' in the global namespace
using ::llrintf;
      ~~^
/usr/include/c++/v1/cmath:1336:86: error: use of undeclared identifier 'llrintf'
inline _LIBCPP_INLINE_VISIBILITY long long llrint(float __x) _NOEXCEPT       {return llrintf(__x);}
                                                                                     ^
/usr/include/c++/v1/cmath:1337:86: error: use of undeclared identifier 'llrintl'
inline _LIBCPP_INLINE_VISIBILITY long long llrint(long double __x) _NOEXCEPT {return llrintl(__x);}
                                                                                     ^
/usr/include/c++/v1/cmath:1342:35: error: call to 'llrint' is ambiguous
llrint(_A1 __x) _NOEXCEPT {return llrint((double)__x);}
                                  ^~~~~~
/usr/include/c++/v1/cmath:1336:44: note: candidate function
inline _LIBCPP_INLINE_VISIBILITY long long llrint(float __x) _NOEXCEPT       {return llrintf(__x);}
                                           ^
/usr/include/c++/v1/cmath:1337:44: note: candidate function
inline _LIBCPP_INLINE_VISIBILITY long long llrint(long double __x) _NOEXCEPT {return llrintl(__x);}
                                           ^
/usr/include/c++/v1/cmath:1346:9: error: no member named 'llround' in the global namespace
using ::llround;
      ~~^
/usr/include/c++/v1/cmath:1347:9: error: no member named 'llroundf' in the global namespace
using ::llroundf;
      ~~^
/usr/include/c++/v1/cmath:1349:87: error: use of undeclared identifier 'llroundf'
inline _LIBCPP_INLINE_VISIBILITY long long llround(float __x) _NOEXCEPT       {return llroundf(__x);}
                                                                                      ^
/usr/include/c++/v1/cmath:1350:87: error: use of undeclared identifier 'llroundl'
inline _LIBCPP_INLINE_VISIBILITY long long llround(long double __x) _NOEXCEPT {return llroundl(__x);}
                                                                                      ^
/usr/include/c++/v1/cmath:1355:36: error: call to 'llround' is ambiguous
llround(_A1 __x) _NOEXCEPT {return llround((double)__x);}
                                   ^~~~~~~
/usr/include/c++/v1/cmath:1349:44: note: candidate function
inline _LIBCPP_INLINE_VISIBILITY long long llround(float __x) _NOEXCEPT       {return llroundf(__x);}
                                           ^
/usr/include/c++/v1/cmath:1350:44: note: candidate function
inline _LIBCPP_INLINE_VISIBILITY long long llround(long double __x) _NOEXCEPT {return llroundl(__x);}
                                           ^
/usr/include/c++/v1/cmath:1649:9: error: no member named 'llrintl' in the global namespace
using ::llrintl;
      ~~^
/usr/include/c++/v1/cmath:1650:9: error: no member named 'llroundl' in the global namespace
using ::llroundl;
      ~~^
12 errors generated.
make[2]: *** [CMakeFiles/foo.dir/foo.cpp.o] Error 1
make[1]: *** [CMakeFiles/foo.dir/all] Error 2
make: *** [all] Error 2