Unnecessary class redefinition for FLTK

For some reason, the MSVC compiler gives the numeric definition of Fl_Button in the FLTK header file 'Enumerations.h' more precedence than a class of the same name. The following code failed to compile:

Fl_Button *confirm = new Fl_Button(0,0, 200, 50, "Hello world"));

Although, I have solved the problem by casting Fl_Button to its inherited class:

class Fl_Button_t : Fl_Button {};
Fl_Button_t *confirm = (Fl_Button_t*)(new Fl_Button(0,0, 200, 50, "Hello world"));

Is there a better approach for sorting out this name clash in the FLTK headers?