Errors building GtkD on windows

[Enjoys Math]

Well I can get it to build using the bud method provided but I 
was concerned that gtkgl wasn't built into the final lib, but 
just noticed that the .brf file includes the srcgl directory.  So 
surely gl stuff is included in the final GtkD.lib when budding?  
It's weird though that I need to include the libraries glu32.lib 
and opengl32.lib when building SimpleGL.d