diff --git a/android/androidmk.go b/android/androidmk.go
index feaef1f..f48c06b 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -29,6 +29,7 @@
 	"os"
 	"path/filepath"
 	"reflect"
+	"runtime"
 	"sort"
 	"strings"
 
@@ -902,6 +903,13 @@
 		return true
 	}
 
+	// On Mac, only expose host darwin modules to Make, as that's all we claim to support.
+	// In reality, some of them depend on device-built (Java) modules, so we can't disable all
+	// device modules in Soong, but we can hide them from Make (and thus the build user interface)
+	if runtime.GOOS == "darwin" && module.Os() != Darwin {
+		return true
+	}
+
 	return !module.Enabled() ||
 		module.commonProperties.HideFromMake ||
 		// Make does not understand LinuxBionic
diff --git a/android/androidmk_test.go b/android/androidmk_test.go
index 8eda9b2..ecfb008 100644
--- a/android/androidmk_test.go
+++ b/android/androidmk_test.go
@@ -18,6 +18,7 @@
 	"fmt"
 	"io"
 	"reflect"
+	"runtime"
 	"strings"
 	"testing"
 
@@ -155,6 +156,11 @@
 }
 
 func TestAndroidMkSingleton_PassesUpdatedAndroidMkDataToCustomCallback(t *testing.T) {
+	if runtime.GOOS == "darwin" {
+		// Device modules are not exported on Mac, so this test doesn't work.
+		t.SkipNow()
+	}
+
 	bp := `
 	custom {
 		name: "foo",
diff --git a/cmd/multiproduct_kati/Android.bp b/cmd/multiproduct_kati/Android.bp
index e5be6c0..20ca2a3 100644
--- a/cmd/multiproduct_kati/Android.bp
+++ b/cmd/multiproduct_kati/Android.bp
@@ -31,4 +31,14 @@
     testSrcs: [
         "main_test.go",
     ],
+    linux: {
+        srcs: [
+            "main_linux.go",
+        ],
+    },
+    darwin: {
+        srcs: [
+            "main_darwin.go",
+        ],
+    },
 }
diff --git a/cmd/multiproduct_kati/main.go b/cmd/multiproduct_kati/main.go
index 07b1e3f..0577c86 100644
--- a/cmd/multiproduct_kati/main.go
+++ b/cmd/multiproduct_kati/main.go
@@ -166,15 +166,6 @@
 	MainLogsDir string
 }
 
-func detectTotalRAM() uint64 {
-	var info syscall.Sysinfo_t
-	err := syscall.Sysinfo(&info)
-	if err != nil {
-		panic(err)
-	}
-	return info.Totalram * uint64(info.Unit)
-}
-
 func findNamedProducts(soongUi string, log logger.Logger) []string {
 	cmd := exec.Command(soongUi, "--dumpvars-mode", "--vars=all_named_products")
 	output, err := cmd.Output()
diff --git a/cmd/multiproduct_kati/main_darwin.go b/cmd/multiproduct_kati/main_darwin.go
new file mode 100644
index 0000000..3d1b12a
--- /dev/null
+++ b/cmd/multiproduct_kati/main_darwin.go
@@ -0,0 +1,20 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+func detectTotalRAM() uint64 {
+	// unimplemented stub on darwin
+	return 0
+}
diff --git a/cmd/multiproduct_kati/main_linux.go b/cmd/multiproduct_kati/main_linux.go
new file mode 100644
index 0000000..db74496
--- /dev/null
+++ b/cmd/multiproduct_kati/main_linux.go
@@ -0,0 +1,28 @@
+// Copyright 2017 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"syscall"
+)
+
+func detectTotalRAM() uint64 {
+	var info syscall.Sysinfo_t
+	err := syscall.Sysinfo(&info)
+	if err != nil {
+		panic(err)
+	}
+	return info.Totalram * uint64(info.Unit)
+}