golang供应商路径找不到包

我正在从 github.com/tarm/serial

案例1:如果将上述回购签入 $GOPATH/src/github.com/tarm/serial

案例2:如果回购在 $GOPATH/src/vendor/github.com/tarm/serial 这个 go build 指挥部会抱怨的 cannot find package "github.com/tarm/serial

案例3:The other SO answers ./vendor 所以包裹在 ./vendor/github.com/tarm/serial . 那也不行。

细节:

失败的命令

gotester:~/testdir$ go build uarttest_main.go
uarttest_main.go:5:9: cannot find package "github.com/tarm/serial" in any of:
    /home/gotester/bin/go/src/github.com/tarm/serial (from $GOROOT)
    /home/gotester/testdir/libs/src/github.com/tarm/serial (from $GOPATH)

源代码位于 ./ :

gotester:~/testdir$ cat uarttest_main.go
package main

import (
        "log"
        "github.com/tarm/serial"
)

func main() {
        c := &serial.Config{Name: "COM45", Baud: 115200}
        s, err := serial.OpenPort(c)
        if err != nil {
                log.Fatal(err)
        }

        n, err := s.Write([]byte("test"))
        if err != nil {
                log.Fatal(err)
        }

        buf := make([]byte, 128)
        n, err = s.Read(buf)
        if err != nil {
                log.Fatal(err)
        }
        log.Printf("%q", buf[:n])
}

供应商 目录:

gotester:~/testdir$ tree --charset=ascii ./vendor
./vendor
`-- github.com
    `-- tarm
        `-- serial
            |-- basic_test.go
            |-- LICENSE
            |-- README.md
            |-- serial.go
            |-- serial_linux.go
            |-- serial_posix.go
            `-- serial_windows.go

3 directories, 7 files

如果现在运行此命令: mv ./vendor/github.com ./libs/src ,生成将成功。