I have a project using github.com/gofiber/fiber package. I don’t use go modules, i.e. my GO111MODULE="off".
When i try go build . i get following:

# github.com/gofiber/fiber
../github.com/gofiber/fiber/helpers.go:300:12: undefined: fasthttp.VisitHeaderParams
../github.com/gofiber/fiber/helpers.go:441:14: undefined: fasthttp.VisitHeaderParams

When i try go get github.com/gofiber/fiber/v2 i get:

cannot find package "github.com/gofiber/fiber/v2" in any of:
    /usr/local/go/src/github.com/gofiber/fiber/v2 (from $GOROOT)
    /home/igor/go/src/github.com/gofiber/fiber/v2 (from $GOPATH)

I have /home/igor/go/src/github.com/gofiber/fiber installed, without postfix /v2
When i try doing the same with GO111MODULE=”on” i get:

~/go/src/ip_mit_service$ go build .  
main.go:6:2: package ip_mit_service/conf_pack is not in GOROOT (/usr/local/go/src/ip_mit_service/conf_pack)
main.go:25:2: package ip_mit_service/http_service is not in GOROOT (/usr/local/go/src/ip_mit_service/http_service)
main.go:26:2: package ip_mit_service/inot_ent_check is not in GOROOT (/usr/local/go/src/ip_mit_service/inot_ent_check)
main.go:16:2: package ip_mit_service/tables_check is not in GOROOT (/usr/local/go/src/ip_mit_service/tables_check)

But these packages must be in GOPATH, not in GOROOT. And they Are in GOPATH actually, but compiler wants them to be in GOROOT. This is why i dont use Go modules. Now i dont know how to compile my code. Any advise will be appreciated. What source should i read to know hoe to solve this problem?

Earlier i just typed go build . and programm was compiled, with GO111MODULE=”off”