So undefined symbols may be just unported to windows part of gtkd library?

...set path to it properly. I build GtkD using dgen.d and link against it...

GtkD relies on gtkglext-3 for it's openGL support it can be found here...

For 32bits Windows fdopen was added to druntime with dmd 2.061.
So you are...

...that library must be installed to use GtkD. GtkD being using static linking (at compile...

but this is compilation error, not runtime or you mean there is another lib I...

...was thinking Derelict, I don't think GtkD is dynamically linked, so you'll also...

...building GtkD 2.1.1, and got this:

C:\D\GtkD\build>build @gtkD.brf...

...to/GtkD/demos/gl/simple
dmd SimpleGL.d -I../../../src -I../../../srcgl ../../../src/GtkD.lib...

...compile command, it looks like you didn't tell the linker where to find GtkD.