View Compilation Error

0_0_26210126_529.cpp: In function 'void convexHull(std::vector<gjcv::Point2f>, std::vector<gjcv::Point2f>&)':
0_0_26210126_529.cpp:55:50: error: 'sort' was not declared in this scope
     sort(points.begin() , points.end(), point_cmp);
                                                  ^
0_0_26210126_529.cpp: In function 'void rotatingClipers(const gjcv::Point2f*, int, int, float*)':
0_0_26210126_529.cpp:81:21: error: 'MAXFLOAT' was not declared in this scope
     float minarea = MAXFLOAT;
                     ^