--- src/github.com/prometheus/node_exporter/Makefile.common.orig	2019-05-24 09:28:29.362000000 +0200
+++ src/github.com/prometheus/node_exporter/Makefile.common	2019-05-24 09:29:43.903000000 +0200
@@ -83,7 +83,7 @@
 	endif
 endif
 
-PREFIX                  ?= $(shell pwd)
+PREFIX                  ?= node_exporter
 BIN_DIR                 ?= $(shell pwd)
 DOCKER_IMAGE_TAG        ?= $(subst /,-,$(shell git rev-parse --abbrev-ref HEAD))
 DOCKER_REPO             ?= prom
@@ -182,24 +182,12 @@
 ifdef GOVENDOR
 	@echo ">> running check for unused packages"
 	@$(GOVENDOR) list +unused | grep . && exit 1 || echo 'No unused packages'
-else
-ifdef GO111MODULE
-	@echo ">> running check for unused/missing packages in go.mod"
-	GO111MODULE=$(GO111MODULE) $(GO) mod tidy
-ifeq (,$(wildcard vendor))
-	@git diff --exit-code -- go.sum go.mod
-else
-	@echo ">> running check for unused packages in vendor/"
-	GO111MODULE=$(GO111MODULE) $(GO) mod vendor
-	@git diff --exit-code -- go.sum go.mod vendor/
-endif
-endif
 endif
 
 .PHONY: common-build
 common-build: promu
 	@echo ">> building binaries"
-	GO111MODULE=$(GO111MODULE) $(PROMU) build --prefix $(PREFIX)
+	USER=portage GO111MODULE=$(GO111MODULE) $(PROMU) build --prefix $(PREFIX)
 
 .PHONY: common-tarball
 common-tarball: promu