diff --git a/cmd/gomobile/bind.go b/cmd/gomobile/bind.go
index 3105db6..e5e1e57 100644
--- a/cmd/gomobile/bind.go
+++ b/cmd/gomobile/bind.go
@@ -130,6 +130,9 @@
 	case "android":
 		return goAndroidBind(gobind, pkgs, targetArchs)
 	case "darwin":
+		if !xcodeAvailable() {
+			return fmt.Errorf("-target=ios requires XCode")
+		}
 		// TODO: use targetArchs?
 		return goIOSBind(gobind, pkgs)
 	default:
diff --git a/cmd/gomobile/bind_androidapp.go b/cmd/gomobile/bind_androidapp.go
index 06b7f0c..145df64 100644
--- a/cmd/gomobile/bind_androidapp.go
+++ b/cmd/gomobile/bind_androidapp.go
@@ -6,6 +6,7 @@
 
 import (
 	"archive/zip"
+	"errors"
 	"fmt"
 	"go/build"
 	"io"
@@ -22,6 +23,10 @@
 		return fmt.Errorf("this command requires ANDROID_HOME environment variable (path to the Android SDK)")
 	}
 
+	if !hasNDK() {
+		return errors.New("no Android NDK path is set. Please run gomobile init with the ndk-bundle installed through the Android SDK manager or with the -ndk flag set.")
+	}
+
 	// Run gobind to generate the bindings
 	cmd := exec.Command(
 		gobind,