diff --git a/target/board/Android.mk b/target/board/Android.mk
index 6f0731b..7f8e349 100644
--- a/target/board/Android.mk
+++ b/target/board/Android.mk
@@ -71,8 +71,15 @@
 LOCAL_MODULE_PATH   := $(TARGET_OUT)
 
 GEN := $(local-generated-sources-dir)/manifest.xml
+
+$(GEN): PRIVATE_FLAGS :=
+ifdef BUILT_VENDOR_MATRIX
+$(GEN): $(BUILT_VENDOR_MATRIX)
+$(GEN): PRIVATE_FLAGS := -c "$(BUILT_VENDOR_MATRIX)"
+endif
+
 $(GEN): $(FRAMEWORK_MANIFEST_FILE) $(HOST_OUT_EXECUTABLES)/assemble_vintf
-	BOARD_SEPOLICY_VERS=$(BOARD_SEPOLICY_VERS) $(HOST_OUT_EXECUTABLES)/assemble_vintf -i $< -o $@
+	BOARD_SEPOLICY_VERS=$(BOARD_SEPOLICY_VERS) $(HOST_OUT_EXECUTABLES)/assemble_vintf -i $< -o $@ $(PRIVATE_FLAGS)
 
 LOCAL_PREBUILT_MODULE_FILE := $(GEN)
 include $(BUILD_PREBUILT)
@@ -86,10 +93,16 @@
 LOCAL_MODULE_PATH   := $(TARGET_OUT)
 
 GEN := $(local-generated-sources-dir)/compatibility_matrix.xml
+
+$(GEN): PRIVATE_FLAGS :=
+ifdef BUILT_VENDOR_MANIFEST
+$(GEN): $(BUILT_VENDOR_MANIFEST)
+$(GEN): PRIVATE_FLAGS := -c "$(BUILT_VENDOR_MANIFEST)"
+endif
+
 $(GEN): $(FRAMEWORK_COMPATIBILITY_MATRIX_FILE) $(HOST_OUT_EXECUTABLES)/assemble_vintf
 	# TODO(b/37405869) (b/37715375) inject avb versions as well for devices that have avb enabled.
-	POLICYVERS=$(POLICYVERS) BOARD_SEPOLICY_VERS=$(BOARD_SEPOLICY_VERS) $(HOST_OUT_EXECUTABLES)/assemble_vintf -i $< -o $@
-
+	POLICYVERS=$(POLICYVERS) BOARD_SEPOLICY_VERS=$(BOARD_SEPOLICY_VERS) $(HOST_OUT_EXECUTABLES)/assemble_vintf -i $< -o $@ $(PRIVATE_FLAGS)
 LOCAL_PREBUILT_MODULE_FILE := $(GEN)
 include $(BUILD_PREBUILT)
 BUILT_SYSTEM_COMPATIBILITY_MATRIX := $(LOCAL_BUILT_MODULE)