diff --git a/cmd/gomobile/bind_test.go b/cmd/gomobile/bind_test.go
index 9b5f43c..ea179b4 100644
--- a/cmd/gomobile/bind_test.go
+++ b/cmd/gomobile/bind_test.go
@@ -201,7 +201,7 @@
 		t.Skipf("gomobile and gobind are not available on %s", runtime.GOOS)
 	}
 
-	dir, err := ioutil.TempDir("", "")
+	dir, err := ioutil.TempDir("", "gomobile-test")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -243,27 +243,32 @@
 				out = filepath.Join(dir, "Cgopkg.framework")
 			}
 
-			// Absolute path
-			{
-				cmd := exec.Command(filepath.Join(dir, "gomobile"), "bind", "-target="+target, "-o="+out, "golang.org/x/mobile/bind/testdata/cgopkg")
-				cmd.Env = append(os.Environ(), "PATH="+path, "GO111MODULE=on")
-				var b bytes.Buffer
-				cmd.Stderr = &b
-				if err := cmd.Run(); err != nil {
-					t.Errorf("%v: %s", err, string(b.Bytes()))
-				}
+			tests := []struct {
+				Name string
+				Path string
+				Dir  string
+			}{
+				{
+					Name: "Absolute Path",
+					Path: "golang.org/x/mobile/bind/testdata/cgopkg",
+				},
+				{
+					Name: "Relative Path",
+					Path: "./bind/testdata/cgopkg",
+					Dir:  filepath.Join("..", ".."),
+				},
 			}
 
-			// Relative path
-			{
-				cmd := exec.Command(filepath.Join(dir, "gomobile"), "bind", "-target="+target, "-o="+out, "./bind/testdata/cgopkg")
-				cmd.Env = append(os.Environ(), "PATH="+path, "GO111MODULE=on")
-				cmd.Dir = filepath.Join("..", "..")
-				var b bytes.Buffer
-				cmd.Stderr = &b
-				if err := cmd.Run(); err != nil {
-					t.Errorf("%v: %s", err, string(b.Bytes()))
-				}
+			for _, tc := range tests {
+				tc := tc
+				t.Run(tc.Name, func(t *testing.T) {
+					cmd := exec.Command(filepath.Join(dir, "gomobile"), "bind", "-target="+target, "-o="+out, tc.Path)
+					cmd.Env = append(os.Environ(), "PATH="+path, "GO111MODULE=on")
+					cmd.Dir = tc.Dir
+					if out, err := cmd.CombinedOutput(); err != nil {
+						t.Errorf("gomobile bind failed: %v\n%s", err, string(out))
+					}
+				})
 			}
 		})
 	}
diff --git a/cmd/gomobile/build.go b/cmd/gomobile/build.go
index 450cd22..bbb2dfb 100644
--- a/cmd/gomobile/build.go
+++ b/cmd/gomobile/build.go
@@ -12,7 +12,6 @@
 	"io"
 	"os"
 	"os/exec"
-	"path"
 	"regexp"
 	"strings"
 
@@ -92,7 +91,7 @@
 	case 0:
 		buildPath = "."
 	case 1:
-		buildPath = path.Clean(args[0])
+		buildPath = args[0]
 	default:
 		cmd.usage()
 		os.Exit(1)
@@ -118,10 +117,7 @@
 	case "android":
 		if pkg.Name != "main" {
 			for _, arch := range targetArchs {
-				env := androidEnv[arch]
-				// gomobile-build does not support Go modules yet.
-				env = append(env, "GO111MODULE=off")
-				if err := goBuild(pkg.PkgPath, env); err != nil {
+				if err := goBuild(pkg.PkgPath, androidEnv[arch]); err != nil {
 					return nil, err
 				}
 			}
@@ -137,10 +133,7 @@
 		}
 		if pkg.Name != "main" {
 			for _, arch := range targetArchs {
-				env := darwinEnv[arch]
-				// gomobile-build does not support Go modules yet.
-				env = append(env, "GO111MODULE=off")
-				if err := goBuild(pkg.PkgPath, env); err != nil {
+				if err := goBuild(pkg.PkgPath, darwinEnv[arch]); err != nil {
 					return nil, err
 				}
 			}
diff --git a/cmd/gomobile/build_androidapp.go b/cmd/gomobile/build_androidapp.go
index e538aa0..b97e945 100644
--- a/cmd/gomobile/build_androidapp.go
+++ b/cmd/gomobile/build_androidapp.go
@@ -69,9 +69,6 @@
 	nmpkgs := make(map[string]map[string]bool) // map: arch -> extractPkgs' output
 
 	for _, arch := range androidArchs {
-		env := androidEnv[arch]
-		// gomobile-build does not support Go modules yet.
-		env = append(env, "GO111MODULE=off")
 		toolchain := ndk.Toolchain(arch)
 		libPath := "lib/" + toolchain.abi + "/lib" + libName + ".so"
 		libAbsPath := filepath.Join(tmpdir, libPath)
@@ -80,7 +77,7 @@
 		}
 		err = goBuild(
 			pkg.PkgPath,
-			env,
+			androidEnv[arch],
 			"-buildmode=c-shared",
 			"-o", libAbsPath,
 		)
diff --git a/cmd/gomobile/build_darwin_test.go b/cmd/gomobile/build_darwin_test.go
index 73e1b81..ce760a3 100644
--- a/cmd/gomobile/build_darwin_test.go
+++ b/cmd/gomobile/build_darwin_test.go
@@ -94,10 +94,10 @@
 echo "{{template "infoplist" .Xinfo}}" > $WORK/main/Info.plist
 mkdir -p $WORK/main/Images.xcassets/AppIcon.appiconset
 echo "{{.Xcontents}}" > $WORK/main/Images.xcassets/AppIcon.appiconset/Contents.json{{end}}
-GOARM=7 GOOS=darwin GOARCH=arm CC=iphoneos-clang CXX=iphoneos-clang++ CGO_CFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch armv7 CGO_CXXFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch armv7 CGO_LDFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch armv7 CGO_ENABLED=1 GO111MODULE=off go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/arm {{end}}{{.Pkg}}
-GOOS=darwin GOARCH=arm64 CC=iphoneos-clang CXX=iphoneos-clang++ CGO_CFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch arm64 CGO_CXXFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch arm64 CGO_LDFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch arm64 CGO_ENABLED=1 GO111MODULE=off go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/arm64 {{end}}{{.Pkg}}
-GOOS=darwin GOARCH=386 CC=iphonesimulator-clang CXX=iphonesimulator-clang++ CGO_CFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch i386 CGO_CXXFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch i386 CGO_LDFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch i386 CGO_ENABLED=1 GO111MODULE=off go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/386 {{end}}{{.Pkg}}
-GOOS=darwin GOARCH=amd64 CC=iphonesimulator-clang CXX=iphonesimulator-clang++ CGO_CFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch x86_64 CGO_CXXFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch x86_64 CGO_LDFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch x86_64 CGO_ENABLED=1 GO111MODULE=off go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/amd64 {{end}}{{.Pkg}}{{if .Main}}
+GOARM=7 GOOS=darwin GOARCH=arm CC=iphoneos-clang CXX=iphoneos-clang++ CGO_CFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch armv7 CGO_CXXFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch armv7 CGO_LDFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch armv7 CGO_ENABLED=1 go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/arm {{end}}{{.Pkg}}
+GOOS=darwin GOARCH=arm64 CC=iphoneos-clang CXX=iphoneos-clang++ CGO_CFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch arm64 CGO_CXXFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch arm64 CGO_LDFLAGS=-isysroot=iphoneos -miphoneos-version-min=7.0 -fembed-bitcode -arch arm64 CGO_ENABLED=1 go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/arm64 {{end}}{{.Pkg}}
+GOOS=darwin GOARCH=386 CC=iphonesimulator-clang CXX=iphonesimulator-clang++ CGO_CFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch i386 CGO_CXXFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch i386 CGO_LDFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch i386 CGO_ENABLED=1 go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/386 {{end}}{{.Pkg}}
+GOOS=darwin GOARCH=amd64 CC=iphonesimulator-clang CXX=iphonesimulator-clang++ CGO_CFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch x86_64 CGO_CXXFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch x86_64 CGO_LDFLAGS=-isysroot=iphonesimulator -mios-simulator-version-min=7.0 -fembed-bitcode -arch x86_64 CGO_ENABLED=1 go build -tags tag1 ios -x {{if .Main}}-ldflags=-w -o=$WORK/amd64 {{end}}{{.Pkg}}{{if .Main}}
 xcrun lipo -o $WORK/main/main -create $WORK/arm $WORK/arm64 $WORK/386 $WORK/amd64
 mkdir -p $WORK/main/assets
 xcrun xcodebuild -configuration Release -project $WORK/main.xcodeproj -allowProvisioningUpdates DEVELOPMENT_TEAM={{.TeamID}}
diff --git a/cmd/gomobile/build_iosapp.go b/cmd/gomobile/build_iosapp.go
index b9db63a..a0103de 100644
--- a/cmd/gomobile/build_iosapp.go
+++ b/cmd/gomobile/build_iosapp.go
@@ -73,10 +73,7 @@
 	for _, arch := range archs {
 		path := filepath.Join(tmpdir, arch)
 		// Disable DWARF; see golang.org/issues/25148.
-		env := darwinEnv[arch]
-		// gomobile-build does not support Go modules yet.
-		env = append(env, "GO111MODULE=off")
-		if err := goBuild(src, env, "-ldflags=-w", "-o="+path); err != nil {
+		if err := goBuild(src, darwinEnv[arch], "-ldflags=-w", "-o="+path); err != nil {
 			return nil, err
 		}
 		if nmpkgs == nil {
diff --git a/cmd/gomobile/build_test.go b/cmd/gomobile/build_test.go
index 75c601b..9d3fdcd 100644
--- a/cmd/gomobile/build_test.go
+++ b/cmd/gomobile/build_test.go
@@ -6,7 +6,9 @@
 
 import (
 	"bytes"
+	"io/ioutil"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -109,7 +111,7 @@
 var androidBuildTmpl = template.Must(template.New("output").Parse(`GOMOBILE={{.GOPATH}}/pkg/gomobile
 WORK=$WORK
 mkdir -p $WORK/lib/armeabi-v7a
-GOOS=android GOARCH=arm CC=$NDK_PATH/toolchains/llvm/prebuilt/{{.NDKARCH}}/bin/armv7a-linux-androideabi16-clang CXX=$NDK_PATH/toolchains/llvm/prebuilt/{{.NDKARCH}}/bin/armv7a-linux-androideabi16-clang++ CGO_ENABLED=1 GOARM=7 GO111MODULE=off go build -tags tag1 -x -buildmode=c-shared -o $WORK/lib/armeabi-v7a/libbasic.so golang.org/x/mobile/example/basic
+GOOS=android GOARCH=arm CC=$NDK_PATH/toolchains/llvm/prebuilt/{{.NDKARCH}}/bin/armv7a-linux-androideabi16-clang CXX=$NDK_PATH/toolchains/llvm/prebuilt/{{.NDKARCH}}/bin/armv7a-linux-androideabi16-clang++ CGO_ENABLED=1 GOARM=7 go build -tags tag1 -x -buildmode=c-shared -o $WORK/lib/armeabi-v7a/libbasic.so golang.org/x/mobile/example/basic
 `))
 
 func TestParseBuildTargetFlag(t *testing.T) {
@@ -183,3 +185,87 @@
 		}
 	}
 }
+
+func TestBuildWithGoModules(t *testing.T) {
+	if runtime.GOOS == "android" {
+		t.Skipf("gomobile are not available on %s", runtime.GOOS)
+	}
+
+	dir, err := ioutil.TempDir("", "gomobile-test")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir)
+
+	if out, err := exec.Command("go", "build", "-o="+dir, "golang.org/x/mobile/cmd/gomobile").CombinedOutput(); err != nil {
+		t.Fatalf("%v: %s", err, string(out))
+	}
+	path := dir
+	if p := os.Getenv("PATH"); p != "" {
+		path += string(filepath.ListSeparator) + p
+	}
+
+	for _, target := range []string{"android", "ios"} {
+		t.Run(target, func(t *testing.T) {
+			if target == "ios" {
+				t.Skip("gomobile-build doesn't work for iOS. see https://golang.org/issue/32963")
+			}
+
+			switch target {
+			case "android":
+				androidHome := os.Getenv("ANDROID_HOME")
+				if androidHome == "" {
+					t.Skip("ANDROID_HOME not found, skipping bind")
+				}
+				if _, err := androidAPIPath(); err != nil {
+					t.Skip("No android API platform found in $ANDROID_HOME, skipping bind")
+				}
+			case "ios":
+				if !xcodeAvailable() {
+					t.Skip("Xcode is missing")
+				}
+			}
+
+			var out string
+			switch target {
+			case "android":
+				out = filepath.Join(dir, "basic.apk")
+			case "ios":
+				out = filepath.Join(dir, "Basic.app")
+			}
+
+			tests := []struct {
+				Name string
+				Path string
+				Dir  string
+			}{
+				{
+					Name: "Absolute Path",
+					Path: "golang.org/x/mobile/example/basic",
+				},
+				{
+					Name: "Relative Path",
+					Path: "./example/basic",
+					Dir:  filepath.Join("..", ".."),
+				},
+			}
+
+			for _, tc := range tests {
+				tc := tc
+				t.Run(tc.Name, func(t *testing.T) {
+					args := []string{"build", "-target=" + target, "-o=" + out}
+					if target == "ios" {
+						args = append(args, "-bundleid=org.golang.gomobiletest")
+					}
+					args = append(args, tc.Path)
+					cmd := exec.Command(filepath.Join(dir, "gomobile"), args...)
+					cmd.Env = append(os.Environ(), "PATH="+path, "GO111MODULE=on")
+					cmd.Dir = tc.Dir
+					if out, err := cmd.CombinedOutput(); err != nil {
+						t.Errorf("gomobile build failed: %v\n%s", err, string(out))
+					}
+				})
+			}
+		})
+	}
+}