diff --git a/core/base_rules.mk b/core/base_rules.mk
index 8b9024a..494f75b 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -496,10 +496,12 @@
   # Define a copy rule to install the module.
   # acp and libraries that it uses can't use acp for
   # installation;  hence, LOCAL_ACP_UNAVAILABLE.
+$(LOCAL_INSTALLED_MODULE): PRIVATE_POST_INSTALL_CMD := $(LOCAL_POST_INSTALL_CMD)
 ifneq ($(LOCAL_ACP_UNAVAILABLE),true)
 $(LOCAL_INSTALLED_MODULE): $(LOCAL_BUILT_MODULE) | $(ACP)
 	@echo "Install: $@"
 	$(copy-file-to-new-target)
+	$(PRIVATE_POST_INSTALL_CMD)
 else
 $(LOCAL_INSTALLED_MODULE): $(LOCAL_BUILT_MODULE)
 	@echo "Install: $@"
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index e56180d..38c18f1 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -131,6 +131,7 @@
 LOCAL_DONT_DELETE_JAR_META_INF:=
 LOCAL_ADDITIONAL_CERTIFICATES:=
 LOCAL_PREBUILT_MODULE_FILE:=
+LOCAL_POST_INSTALL_CMD:=
 
 # Trim MAKEFILE_LIST so that $(call my-dir) doesn't need to
 # iterate over thousands of entries every time.
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index 620001b..f29aaa7 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -144,10 +144,13 @@
 $(full_target): PRIVATE_OUT_CUSTOM_ASSET_DIR := $(out_dir)/$(LOCAL_DROIDDOC_CUSTOM_ASSET_DIR)
 ifneq ($(strip $(LOCAL_DROIDDOC_HTML_DIR)),)
 $(full_target): PRIVATE_DROIDDOC_HTML_DIR := -htmldir $(LOCAL_PATH)/$(LOCAL_DROIDDOC_HTML_DIR)
-html_dir_files := $(shell find $(LOCAL_PATH)/$(LOCAL_DROIDDOC_HTML_DIR) -type f)
 else
-$(full_target): PRIVATE_DROIDDOC_HTML_DIR :=
-html_dir_files :=
+$(full_target): PRIVATE_DROIDDOC_HTML_DIR := 
+endif
+ifneq ($(strip $(LOCAL_ADDITIONAL_HTML_DIR)),)
+$(full_target): PRIVATE_ADDITIONAL_HTML_DIR := -htmldir2 $(LOCAL_PATH)/$(LOCAL_ADDITIONAL_HTML_DIR)
+else
+$(full_target): PRIVATE_ADDITIONAL_HTML_DIR :=
 endif
 ifneq ($(strip $(LOCAL_ADDITIONAL_HTML_DIR)),)
 $(full_target): PRIVATE_ADDITIONAL_HTML_DIR := -htmldir2 $(LOCAL_PATH)/$(LOCAL_ADDITIONAL_HTML_DIR)
@@ -158,6 +161,8 @@
 # TODO: not clear if this is used any more
 $(full_target): PRIVATE_LOCAL_PATH := $(LOCAL_PATH)
 
+html_dir_files := $(shell find $(LOCAL_PATH)/$(LOCAL_DROIDDOC_HTML_DIR) -type f)
+
 $(full_target): $(full_src_files) $(droiddoc_templates) $(droiddoc) $(html_dir_files) $(full_java_lib_deps) $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	@echo Docs droiddoc: $(PRIVATE_OUT_DIR)
 	$(hide) mkdir -p $(dir $(full_target))