build fail in centos7 env

[superstring]

here is log

[root@hadoop100 flume_exporter]# make build
go: github.com/prometheus/promu upgrade => v0.5.0
go: google.golang.org/appengine upgrade => v1.6.5
go: github.com/prometheus/client_golang upgrade => v1.5.1
go: github.com/beorn7/perks upgrade => v1.0.1
go: github.com/prometheus/client_model upgrade => v0.2.0
go: gopkg.in/yaml.v2 upgrade => v2.2.8
go: github.com/pkg/errors upgrade => v0.9.1
go: golang.org/x/sys upgrade => v0.0.0-20200413165638-669c56c373c4
go: github.com/alecthomas/template upgrade => v0.0.0-20190718012654-fb15b899a751
go: github.com/prometheus/common upgrade => v0.9.1
go: golang.org/x/oauth2 upgrade => v0.0.0-20200107190931-bf48bf16ab8d
go: github.com/alecthomas/units upgrade => v0.0.0-20190924025748-f65c72e2690d
go: github.com/prometheus/procfs upgrade => v0.0.11
go: github.com/golang/protobuf upgrade => v1.4.0
go: github.com/google/go-github/v25 upgrade => v25.1.3
go: golang.org/x/net upgrade => v0.0.0-20200324143707-d3edc9973b7e
go: google.golang.org/protobuf upgrade => v1.21.0
>> building binaries
 >   flume_exporter
can't load package: cannot find module providing package github.com/woozhijun/flume_exporter: working directory is not part of a module
!! command failed: build -o /root/go/src/github.com/woozhijun/flume_exporter/flume_exporter -ldflags -X github.com/prometheus/common/version.Version=0.0.2 -X github.com/prometheus/common/version.Revision=3fcc3edffd58e51b3a54046da1701a817789802c -X github.com/prometheus/common/version.Branch=master -X github.com/prometheus/common/version.BuildUser=root@hadoop100 -X github.com/prometheus/common/version.BuildDate=20200419-00:07:11  -extldflags '-static' -a -tags netgo github.com/woozhijun/flume_exporter: exit status 1
make: *** [build] 错误 1
[root@hadoop100 flume_exporter]# 

[woozhijun]

you need to create $GOPATH/github.com/woozhijun/flume_exporter build