我正在尝试go build在目录中运行命令$GOPATH/src/call/httptest：

maks@myMac ~/Dropbox/golang/src/call/httptest $ go build
# call/httptest
./domain.go:4: can't find import: "call"

有错误 ./domain.go:4: can't find import: "call"

domain.go文件的开头：

package httptest

import (
    "call" // line 4 - error is here
)

我可以成功建立$GOPATH/src/call目录：

maks@myMac ~/Dropbox/golang/src/call $ go build

为什么我不能导入call的$GOPATH/src/call/httptest/domain.go文件虽然call是在$GOPATH/src目录中？

Gopath如下：

$ echo $GOPATH
/Users/maks/Dropbox/golang

$ go version
go version go1.4.3 darwin/amd64

更新资料

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