go:linkname must refer to declared function or variable

下载完 gin 框架之后报错

# golang.org/x/sys/unix
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/syscall_darwin.1_13.go:25:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.1_13.go:27:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.1_13.go:40:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:28:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:43:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:59:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:75:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:90:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:105:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:121:3: //go:linkname must refer to declared function or variable
../../../go/pkg/mod/golang.org/x/sys@v0.0.0-20200223170610-d5e6a3e2c0ae/unix/zsyscall_darwin_amd64.go:121:3: too many errors

解决办法

 go get -u golang.org/x/sys