codegangsta/martini — pull request #59 by ioboi (2013-11-17 20:23:53+00:00)
Title: add buildtag to notify if go version < 1.1 #49

The output would look like this:
```
go_version.go:3:1: expected 'package', found 'STRING' "martini requires go 1.1 or greater to build"
```