diff --git a/Makefile b/Makefile
index 474fe61ed5..67095f4d00 100644
--- a/Makefile
+++ b/Makefile
@@ -10,33 +10,34 @@
 
 GOBIN = ./build/bin
 GO ?= latest
+GORUN = env GO111MODULE=on go run
 
 geth:
-	build/env.sh go run build/ci.go install ./cmd/geth
+	$(GORUN) build/ci.go install ./cmd/geth
 	@echo "Done building."
 	@echo "Run \"$(GOBIN)/geth\" to launch geth."
 
 all:
-	build/env.sh go run build/ci.go install
+	$(GORUN) build/ci.go install
 
 android:
-	build/env.sh go run build/ci.go aar --local
+	$(GORUN) build/ci.go aar --local
 	@echo "Done building."
 	@echo "Import \"$(GOBIN)/geth.aar\" to use the library."
 
 ios:
-	build/env.sh go run build/ci.go xcode --local
+	$(GORUN) build/ci.go xcode --local
 	@echo "Done building."
 	@echo "Import \"$(GOBIN)/Geth.framework\" to use the library."
 
 test: all
-	build/env.sh go run build/ci.go test
+	$(GORUN) build/ci.go test
 
 lint: ## Run linters.
-	build/env.sh go run build/ci.go lint
+	$(GORUN) build/ci.go lint
 
 clean:
-	go clean -cache
+	env GO111MODULE=on go clean -cache
 	rm -fr build/_workspace/pkg/ $(GOBIN)/*
 
 # The devtools target installs tools required for 'go generate'.
@@ -63,12 +64,12 @@ geth-linux: geth-linux-386 geth-linux-amd64 geth-linux-arm geth-linux-mips64 get
 	@ls -ld $(GOBIN)/geth-linux-*
 
 geth-linux-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/386 -v ./cmd/geth
 	@echo "Linux 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep 386
 
 geth-linux-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/amd64 -v ./cmd/geth
 	@echo "Linux amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep amd64
 
@@ -77,42 +78,42 @@ geth-linux-arm: geth-linux-arm-5 geth-linux-arm-6 geth-linux-arm-7 geth-linux-ar
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm
 
 geth-linux-arm-5:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-5 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-5 -v ./cmd/geth
 	@echo "Linux ARMv5 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-5
 
 geth-linux-arm-6:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-6 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-6 -v ./cmd/geth
 	@echo "Linux ARMv6 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-6
 
 geth-linux-arm-7:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm-7 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm-7 -v ./cmd/geth
 	@echo "Linux ARMv7 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm-7
 
 geth-linux-arm64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/arm64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/arm64 -v ./cmd/geth
 	@echo "Linux ARM64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep arm64
 
 geth-linux-mips:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips
 
 geth-linux-mipsle:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mipsle --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mipsle --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPSle cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mipsle
 
 geth-linux-mips64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips64 --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64 --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips64
 
 geth-linux-mips64le:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=linux/mips64le --ldflags '-extldflags "-static"' -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=linux/mips64le --ldflags '-extldflags "-static"' -v ./cmd/geth
 	@echo "Linux MIPS64le cross compilation done:"
 	@ls -ld $(GOBIN)/geth-linux-* | grep mips64le
 
@@ -121,12 +122,12 @@ geth-darwin: geth-darwin-386 geth-darwin-amd64
 	@ls -ld $(GOBIN)/geth-darwin-*
 
 geth-darwin-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=darwin/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/386 -v ./cmd/geth
 	@echo "Darwin 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-darwin-* | grep 386
 
 geth-darwin-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=darwin/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=darwin/amd64 -v ./cmd/geth
 	@echo "Darwin amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-darwin-* | grep amd64
 
@@ -135,11 +136,11 @@ geth-windows: geth-windows-386 geth-windows-amd64
 	@ls -ld $(GOBIN)/geth-windows-*
 
 geth-windows-386:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=windows/386 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/386 -v ./cmd/geth
 	@echo "Windows 386 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-windows-* | grep 386
 
 geth-windows-amd64:
-	build/env.sh go run build/ci.go xgo -- --go=$(GO) --targets=windows/amd64 -v ./cmd/geth
+	$(GORUN) build/ci.go xgo -- --go=$(GO) --targets=windows/amd64 -v ./cmd/geth
 	@echo "Windows amd64 cross compilation done:"
 	@ls -ld $(GOBIN)/geth-windows-* | grep amd64
diff --git a/build/ci.go b/build/ci.go
index 1ec8e01832..257c479e30 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -214,9 +214,9 @@ func doInstall(cmdline []string) {
 		var minor int
 		fmt.Sscanf(strings.TrimPrefix(runtime.Version(), "go1."), "%d", &minor)
 
-		if minor < 9 {
+		if minor < 11 {
 			log.Println("You have Go version", runtime.Version())
-			log.Println("go-ethereum requires at least Go version 1.9 and cannot")
+			log.Println("go-ethereum requires at least Go version 1.11 and cannot")
 			log.Println("be compiled with an earlier version. Please upgrade your Go installation.")
 			os.Exit(1)
 		}
@@ -237,13 +237,6 @@ func doInstall(cmdline []string) {
 		build.MustRun(goinstall)
 		return
 	}
-	// If we are cross compiling to ARMv5 ARMv6 or ARMv7, clean any previous builds
-	if *arch == "arm" {
-		os.RemoveAll(filepath.Join(runtime.GOROOT(), "pkg", runtime.GOOS+"_arm"))
-		for _, path := range filepath.SplitList(build.GOPATH()) {
-			os.RemoveAll(filepath.Join(path, "pkg", runtime.GOOS+"_arm"))
-		}
-	}
 
 	// Seems we are cross compiling, work around forbidden GOBIN
 	goinstall := goToolArch(*arch, *cc, "install", buildFlags(env)...)
@@ -294,7 +287,6 @@ func goTool(subcmd string, args ...string) *exec.Cmd {
 
 func goToolArch(arch string, cc string, subcmd string, args ...string) *exec.Cmd {
 	cmd := build.GoTool(subcmd, args...)
-	cmd.Env = []string{"GOPATH=" + build.GOPATH()}
 	if arch == "" || arch == runtime.GOARCH {
 		cmd.Env = append(cmd.Env, "GOBIN="+GOBIN)
 	} else {
@@ -888,7 +880,6 @@ func gomobileTool(subcmd string, args ...string) *exec.Cmd {
 	cmd := exec.Command(filepath.Join(GOBIN, "gomobile"), subcmd)
 	cmd.Args = append(cmd.Args, args...)
 	cmd.Env = []string{
-		"GOPATH=" + build.GOPATH(),
 		"PATH=" + GOBIN + string(os.PathListSeparator) + os.Getenv("PATH"),
 	}
 	for _, e := range os.Environ() {
@@ -1078,7 +1069,6 @@ func xgoTool(args []string) *exec.Cmd {
 	cmd := exec.Command(filepath.Join(GOBIN, "xgo"), args...)
 	cmd.Env = os.Environ()
 	cmd.Env = append(cmd.Env, []string{
-		"GOPATH=" + build.GOPATH(),
 		"GOBIN=" + GOBIN,
 	}...)
 	return cmd
diff --git a/build/deb/ethereum/deb.rules b/build/deb/ethereum/deb.rules
index 983b87af16..760e1f0e25 100644
--- a/build/deb/ethereum/deb.rules
+++ b/build/deb/ethereum/deb.rules
@@ -22,7 +22,7 @@ override_dh_auto_build:
 	(mkdir -p build/_workspace/pkg/mod && mv .mod/* build/_workspace/pkg/mod)
 
 	# A fresh Go was built, all dependency downloads faked, hope build works now
-	build/env.sh ../.go/bin/go run build/ci.go install -git-commit={{.Env.Commit}} -git-branch={{.Env.Branch}} -git-tag={{.Env.Tag}} -buildnum={{.Env.Buildnum}} -pull-request={{.Env.IsPullRequest}}
+	../.go/bin/go run build/ci.go install -git-commit={{.Env.Commit}} -git-branch={{.Env.Branch}} -git-tag={{.Env.Tag}} -buildnum={{.Env.Buildnum}} -pull-request={{.Env.IsPullRequest}}
 
 override_dh_auto_test:
 
diff --git a/build/env.sh b/build/env.sh
deleted file mode 100755
index 3914555d1b..0000000000
--- a/build/env.sh
+++ /dev/null
@@ -1,30 +0,0 @@
-#!/bin/sh
-
-set -e
-
-if [ ! -f "build/env.sh" ]; then
-    echo "$0 must be run from the root of the repository."
-    exit 2
-fi
-
-# Create fake Go workspace if it doesn't exist yet.
-workspace="$PWD/build/_workspace"
-root="$PWD"
-ethdir="$workspace/src/github.com/ethereum"
-if [ ! -L "$ethdir/go-ethereum" ]; then
-    mkdir -p "$ethdir"
-    cd "$ethdir"
-    ln -s ../../../../../. go-ethereum
-    cd "$root"
-fi
-
-# Set up the environment to use the workspace.
-GOPATH="$workspace"
-export GOPATH
-
-# Run the command inside the workspace.
-cd "$ethdir/go-ethereum"
-PWD="$ethdir/go-ethereum"
-
-# Launch the arguments with the configured environment.
-exec "$@"
diff --git a/internal/build/util.go b/internal/build/util.go
index 08a71d8777..fc559760b2 100644
--- a/internal/build/util.go
+++ b/internal/build/util.go
@@ -51,15 +51,6 @@ func MustRunCommand(cmd string, args ...string) {
 	MustRun(exec.Command(cmd, args...))
 }
 
-// GOPATH returns the value that the GOPATH environment
-// variable should be set to.
-func GOPATH() string {
-	if os.Getenv("GOPATH") == "" {
-		log.Fatal("GOPATH is not set")
-	}
-	return os.Getenv("GOPATH")
-}
-
 var warnedAboutGit bool
 
 // RunGit runs a git subcommand and returns its output.