added conditional check to support 'make goimports' for go version < …

…1.16

Makefile

@@ -178,9 +178,17 @@ golangci-lint: | $(GOLANGCILINT) ; $(info $(M) running golangci-lint…) @ ## Ru
 golangci-lint-check: | $(GOLANGCILINT) ; $(info $(M) Testing if golint has been done…) @ ## Run golangci-lint for build tests CI job
 	$Q $(GOLANGCILINT) run -j 1 --color=never
 
+GO_VERSION := $(shell go version | awk '{print $$3}' | sed 's/go//')
+GO_OLD_VERSION := $(shell [ "$(GO_VERSION)" \< "1.16" ] && echo 1 || echo 0)
+
 GOIMPORTS = $(BIN)/goimports
+ifeq ($(GO_OLD_VERSION),1)
+$(BIN)/goimports: PACKAGE=golang.org/x/tools/cmd/goimports
+else
 $(BIN)/goimports: | $(BIN) ; $(info $(M) building goimports…)
 	GOBIN=$(BIN) go install golang.org/x/tools/cmd/goimports@latest
+endif
+
 
 .PHONY: goimports
 goimports: | $(GOIMPORTS) ; $(info $(M) running goimports…) ## Run goimports