# ----------------------------------
    # general layout of the land
    # ----------------------------------
    $GOPATH/src/.go
    $GOPATH/src/.go/config
    $GOPATH/src/.go/vendors # for all projects
    
    # ----------------------------------
    # $GOPATH/.go/vendors sketch
    # ----------------------------------
    
    lib/mq = github.com/lib/pq@master 
    mgo = labix.org/v2/mgo
    ... etc
    
    # ----------------------------------
    # specific project 1
    # uses the global version of package labix.org/mgo
    # uses a project specific package hotness
    # ----------------------------------
    
    $GOPATH/src/mygofoo
    $GOPATH/src/mygofoo/foo.go
    $GOPATH/src/mygofoo/.go
    $GOPATH/src/mygofoo/.go/vendors
    
    # ----------------------------------
    # foo.go fragment
    # ----------------------------------
    
    package mygofoo
    
    import (
        "mgo"       // version spec'd in global .go 
        "lib/pq"    // version spec'd in project specific .go
        "hotness"   // version spec'd in project specific .go
        ...
     )
    ...
    
    # ----------------------------------
    # $GOPATH/src/mygofoo/.go/vendors sketch
    # ----------------------------------
    
    lib/mq = github.com/lib/pq@experimental // lets pretend
    hotness = bitbucket.org/wiz/hotness@master
    ... etc
    
    # go tool
    
    > cd $GOPATH/src/mygofoo
    > go build -vendors
    using:
        mgo -> labix.org/v2/mgo
        lib/pq -> github.com/lib/pq@experimental
        hotness -> bitbucket.org/wiz/hotness@master
    >    
    
    # go tool can obviously allow for command line mods of the .go