ofParameter.h compile error

Hi there,

I'm trying to compile the examples of ofxOpenNI and ofxNI2, none of them work due to the same error from this part of ofParameter.h

template <class T> yes check(T const&);
no check(no);

template <typename T>
struct has_loading_support {
    static istream & stream;
    static T & x;
    static const bool value = sizeof(check(stream >> x)) == sizeof(yes);
};

template <typename T>
struct has_saving_support {
    static ostream & stream;
    static T & x;
    static const bool value = sizeof(check(stream << x)) == sizeof(yes);
};

Where I get this:

    ../../../libs/openFrameworks/types/ofParameter.h:327:21: warning: declaration does not declare anything [-Wmissing-declarations]
        template <class T> yes check(T const&);
                           ^~~
../../../libs/openFrameworks/types/ofParameter.h:328:2: warning: declaration does not declare anything [-Wmissing-declarations]
        no check(no);
        ^~
../../../libs/openFrameworks/types/ofParameter.h:334:57: error: expected expression
            static const bool value = sizeof(check(stream >> x)) == sizeof(char);
                                                               ^
../../../libs/openFrameworks/types/ofParameter.h:341:57: error: expected expression
            static const bool value = sizeof(check(stream << x)) == sizeof(char);

This is driving me nuts, makes me wonder why have I accepted yet another Kinect project (I guess it still impresses a lot of people out there)

I'm on OS X 10.10.5
OF from master branch
XCode 7.1, also fails with 6.3.2