Use the make variable so that the correct make gets used.
diff --git a/Makefile b/Makefile
index 2925fbb..4ad5ad3 100644
--- a/Makefile
+++ b/Makefile
@@ -2,17 +2,17 @@
 export NDK_PROJECT_PATH
 
 all:
-	make -C rmidevice all
-	make -C rmi4update all
-	make -C rmihidtool all
+	$(MAKE) -C rmidevice all
+	$(MAKE) -C rmi4update all
+	$(MAKE) -C rmihidtool all
 
 clean:
-	make -C rmidevice clean
-	make -C rmi4update clean
-	make -C rmihidtool clean
+	$(MAKE) -C rmidevice clean
+	$(MAKE) -C rmi4update clean
+	$(MAKE) -C rmihidtool clean
 
 android:
 	ndk-build NDK_APPLICATION_MK=Application.mk
 
 android-clean:
-	ndk-build NDK_APPLICATION_MK=Application.mk clean
\ No newline at end of file
+	ndk-build NDK_APPLICATION_MK=Application.mk clean