qt5 5.5.0 fails to build on OSX 10.11

lalr.cpp:241:1: error: declaration of anonymous struct must be a definition
struct _Nullable: public std::unary_function<Name, bool>
^
lalr.cpp:241:56: error: expected unqualified-id
struct _Nullable: public std::unary_function<Name, bool>
                                                      ^
lalr.cpp:303:98: error: expected expression
         NameList::iterator nn = std::find_if (rule->rhs.begin (), rule->rhs.end (), std::not1 (_Nullable (this)));
                                                                                                ^
lalr.cpp:638:107: error: expected expression
                 NameList::iterator first_not_nullable = std::find_if (dot, rule->rhs.end (), std::not1 (_Nullable (this)));
                                                                                                         ^