New problem with "go get github.com/martini-contrib/oauth2"

[shackra]

I cannot install the package, see:

Project hg: ⎇ default r  
> go get github.com/martini-contrib/sessions
Project hg: ⎇ default r  
> go get github.com/martini-contrib/oauth2
package github.com/martini-contrib/oauth2
        imports github.com/golang/oauth2
        imports github.com/golang/oauth2
        imports github.com/golang/oauth2: code in directory /home/jorge/go-workspace/src/github.com/golang/oauth2 expects import "golang.org/x/oauth2"                                                                                                                                 
Project hg: ⎇ default r  
> go get golang.org/x/oauth2
Project hg: ⎇ default r  
> go get github.com/martini-contrib/oauth2
../../../github.com/martini-contrib/oauth2/oauth2.go:27:2: code in directory /home/jorge/go-workspace/src/github.com/golang/oauth2 expects import "golang.org/x/oauth2"                                                                                                                
Project hg: ⎇ default r  
>