no buildable Go source files

This is related to issue #372 

On a Mac, if I run `go build` everything works smoothly. If I run `GOOS=linux go build` I get the following:

```
go build github.com/mattn/go-sqlite3: no buildable Go source files in $GOPATH/src/github.com/mattn/go-sqlite3
```