在Windows上设置go-gl？ 找不到GLFW？

I'm trying to get go-gl to work on windows. I've downloaded mingw and I've installed glfw according to this question (I put the dll in System32).

I download triangle.go from the examples github and setup this folder structure on my desktop:

/gocode
  /src
    /gogltest
      triangle.go

I set the gocode folder as the gopath, I cd into gogltest and run go get. It downloads the files into gocode/src/github.com/ and I get this output:

# github.com/go-gl/glfw3
..\github.com\go-gl\glfw3\clipboard.go:4:24: fatal error: GLFW/glfw3.h: No such
file or directory
 //#include <GLFW/glfw3.h>
                        ^
compilation terminated.
# github.com/go-gl/gl
In file included from ..\github.com\go-gl\gl\attriblocation.go:7:0:
gl.h:2:21: fatal error: GL/glew.h: No such file or directory
 #include <GL/glew.h>
                     ^
compilation terminated.

What am I missing that will make glfw work for me?