无法运行go install:GOPATH外的目录没有安装位置

当我尝试运行时,go install我得到以下内容:

go install golang-book/chapter11/math: mkdir /Users/Swanros/Go/pkg/darwin_amd64: permission denied

然后我尝试sudo go install获得以下内容:

go install: no install location for directory /Users/Swanros/Go/src/golang-book/chapter11/math outside GOPATH

这是我的go env:

GOARCH="amd64"
GOBIN=""
GOCHAR="6"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/Swanros/Go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
CXX="clang++"
CGO_ENABLED="1"

echo $GOPATH 输出:

/Users/Swanros/Go

我错过了什么？我整个上午一直在处理这件事.