explicit set an "optional" tag
diff --git a/java/Film/Android.mk b/java/Film/Android.mk
index b7f98fc..9e6ed7e 100644
--- a/java/Film/Android.mk
+++ b/java/Film/Android.mk
@@ -17,6 +17,8 @@
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := optional
+
LOCAL_SRC_FILES := $(call all-java-files-under, src)
#LOCAL_STATIC_JAVA_LIBRARIES := android.renderscript
diff --git a/java/Fountain/Android.mk b/java/Fountain/Android.mk
index b6a9f10..f7e53a8 100644
--- a/java/Fountain/Android.mk
+++ b/java/Fountain/Android.mk
@@ -17,6 +17,8 @@
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := optional
+
LOCAL_SRC_FILES := $(call all-java-files-under, src)
#LOCAL_STATIC_JAVA_LIBRARIES := android.renderscript
diff --git a/java/ImageProcessing/Android.mk b/java/ImageProcessing/Android.mk
index 5a844d5..833427b 100644
--- a/java/ImageProcessing/Android.mk
+++ b/java/ImageProcessing/Android.mk
@@ -17,6 +17,8 @@
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
+LOCAL_MODULE_TAGS := optional
+
LOCAL_SRC_FILES := $(call all-java-files-under, src)
#LOCAL_STATIC_JAVA_LIBRARIES := android.renderscript