I'm trying to port a small GL program that I've been working on from Linux to Windows. I have the following:

if (GLEW_ARB_debug_output)
{
    glDebugMessageCallbackARB(&DebugCallback, nullptr);
}

I was surprised to find out that GLEW_ARB_debug_output evaluates to false. Could it be that ARB_debug_output not supported on Windows, with the latest drivers for my video card (an older Radeon HD540v)? Am I doing anything wrong? I thought this extension was rather old, and it would probably be supported everywhere by now.