Failing for me:
$ go get bitbucket.org/santucco/amail
package bitbucket.org/santucco/amail
imports bitbucket.org/santucco/goacme
imports bitbucket.org/santucco/goplumb
imports code.google.com/r/santucco-goplan9/plan9: invalid
code.google.com/ import path "code.google.com/r/santucco-goplan9/plan9"
package bitbucket.org/santucco/amail
imports bitbucket.org/santucco/goacme
imports bitbucket.org/santucco/goplumb
imports code.google.com/r/santucco-goplan9/plan9/client: invalid
code.google.com/ import path
"code.google.com/r/santucco-goplan9/plan9/client"