Compile errors with GtkGLArea

[Alex Diener <adiener sacredsoftware net>]

I'm trying to use GtkGLArea. When I compile my application, I get this 
warning when I try to use the GTK_GL_AREA macro:

warning: implicit declaration of function 'G_TYPE_CHECK_INSTANCE_CAST'

And then it starts spitting out syntax errors. I grepped for 
G_TYPE_CHECK_INSTANCE_CAST in my headers, and found it in 
/usr/include/glib-2.0/gobject/gtype.h. Including this file gives me a 
whole bunch of other errors, though. At the top of gtype.h, it #errors 
if it's included directly, and says that I should include 
<glib-object.h> instead. This doesn't do much better, though.

I've also tried a really ugly hack where I copied all of the relevant 
information from gtype.h into my source file. I got it to compile like 
that, but it gave me a segfault on startup.

I've searched pretty extensively on the Internet, asked around on IRC, 
looked through documentation... Nothing helpful. Anyone have any ideas?

Thanks,
Alex Diener