QGLFramebufferObject incorrectly reports unavailability of FBOs on Mac

When trying the "Framebuffer Object 2 Example" that ships with the Qt package on Mac, I got the dialog that reads: "This system does not support OpenGL/framebuffer objects"

I was sure I've used them on my Mac before (without Qt), so after consulting the Mac OpenGL docs, I was convinced that this should be working. I ended up removing the call to QGLFramebufferObject::hasOpenGLFramebufferObjects(), tried the example again and found that it worked perfectly.

System information:
I'm running a late 2012 MacBook Air (Intel HD4000 graphics which does support FBOs), on Mountain Lion (OS X 10.8) which also supports FBOs. According to "OpenGL Extension Viewer" my system supports both:
GL_ARB_framebuffer_object and GL_EXT_framebuffer_object

As a work-around, I am going to ignore what hasOpenGLFramebufferObjects() returns as I know it is not reporting the availability of FBOs correctly. It would be nice to get this resolved though.