Following developper's guide, beats won't compile

Disclaimer: I am a total noob in Go.

When running from Getting Ready section in Developpers's guide:

go get

I have the following error:

package no buildable Go source files in <GOPATH>/src/

I succeeded build topbeat by making

go get

After having installed all dependencies (see error trace when trying to built it the first time to know what to go get).

There where also an error concerning sigar/gosigar. I just added "sigar" aliases in topbeat.go (l10) and sigar.go (l8)

we've vendored all dependencies in repository. You need to run export GO15VENDOREXPERIMENT=1 before running make.

I opened an issue here to add this to the developer guide: