diff --git a/core/binary.mk b/core/binary.mk
index 776a3ff..17b1bf2 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -545,10 +545,8 @@
 else # LOCAL_IS_HOST_MODULE
 
 my_host_global_c_includes := $(SRC_HEADERS) \
-    $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)PROJECT_INCLUDES) \
     $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)C_INCLUDES)
 my_host_global_c_system_includes := $(SRC_SYSTEM_HEADERS) \
-    $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)PROJECT_SYSTEM_INCLUDES) \
     $($(LOCAL_2ND_ARCH_VAR_PREFIX)$(my_prefix)C_SYSTEM_INCLUDES)
 
 ifeq ($(my_clang),true)
diff --git a/core/config.mk b/core/config.mk
index a4b0cea..677d210 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -684,8 +684,6 @@
 RELATIVE_PWD :=
 endif
 
-HOST_PROJECT_INCLUDES :=
-HOST_PROJECT_SYSTEM_INCLUDES := $(HOST_OUT_HEADERS)
 TARGET_PROJECT_INCLUDES :=
 TARGET_PROJECT_SYSTEM_INCLUDES := \
 		$(TARGET_DEVICE_KERNEL_HEADERS) $(TARGET_BOARD_KERNEL_HEADERS) \
@@ -696,21 +694,6 @@
 $(TARGET_2ND_ARCH_VAR_PREFIX)TARGET_PROJECT_SYSTEM_INCLUDES := $(TARGET_PROJECT_SYSTEM_INCLUDES)
 endif
 
-ifdef HOST_2ND_ARCH
-$(HOST_2ND_ARCH_VAR_PREFIX)HOST_PROJECT_INCLUDES := $(HOST_PROJECT_INCLUDES)
-$(HOST_2ND_ARCH_VAR_PREFIX)HOST_PROJECT_SYSTEM_INCLUDES := $(HOST_PROJECT_SYSTEM_INCLUDES)
-endif
-
-ifdef HOST_CROSS_OS
-HOST_CROSS_PROJECT_INCLUDES :=
-HOST_CROSS_PROJECT_SYSTEM_INCLUDES := $(HOST_CROSS_OUT_HEADERS)
-
-ifdef HOST_CROSS_2ND_ARCH
-$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_PROJECT_INCLUDES:= $(HOST_CROSS_PROJECT_INCLUDES)
-$(HOST_CROSS_2ND_ARCH_VAR_PREFIX)HOST_CROSS_PROJECT_SYSTEM_INCLUDES:= $(HOST_CROSS_PROJECT_SYSTEM_INCLUDES)
-endif
-endif
-
 # allow overriding default Java libraries on a per-target basis
 ifeq ($(TARGET_DEFAULT_JAVA_LIBRARIES),)
   TARGET_DEFAULT_JAVA_LIBRARIES := core-oj core-libart core-junit ext framework okhttp
diff --git a/core/copy_headers.mk b/core/copy_headers.mk
index a4fd2ed..c26d51d 100644
--- a/core/copy_headers.mk
+++ b/core/copy_headers.mk
@@ -4,9 +4,8 @@
 ###########################################################
 $(call record-module-type,COPY_HEADERS)
 ifneq ($(strip $(LOCAL_IS_HOST_MODULE)),)
-  my_prefix := HOST_
-else
-  my_prefix := TARGET_
+  $(shell echo $(LOCAL_MODULE_MAKEFILE): $(LOCAL_MODULE): LOCAL_COPY_HEADERS may not be used with host modules >&2)
+  $(error done)
 endif
 
 # Modules linking against the SDK do not have the include path to use
@@ -37,8 +36,8 @@
   $(eval _chFrom := $(LOCAL_PATH)/$(header)) \
   $(eval _chTo := \
       $(if $(LOCAL_COPY_HEADERS_TO),\
-        $($(my_prefix)OUT_HEADERS)/$(LOCAL_COPY_HEADERS_TO)/$(notdir $(header)),\
-        $($(my_prefix)OUT_HEADERS)/$(notdir $(header)))) \
+        $(TARGET_OUT_HEADERS)/$(LOCAL_COPY_HEADERS_TO)/$(notdir $(header)),\
+        $(TARGET_OUT_HEADERS)/$(notdir $(header)))) \
   $(eval ALL_COPIED_HEADERS.$(_chTo).MAKEFILE += $(LOCAL_MODULE_MAKEFILE)) \
   $(eval ALL_COPIED_HEADERS.$(_chTo).SRC += $(_chFrom)) \
   $(if $(filter $(_chTo),$(ALL_COPIED_HEADERS)),, \
diff --git a/core/envsetup.mk b/core/envsetup.mk
index 8794c8a..b08f57c 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -269,7 +269,6 @@
 HOST_CROSS_OUT_COVERAGE := $(HOST_CROSS_OUT)/coverage
 
 HOST_OUT_INTERMEDIATES := $(HOST_OUT)/obj
-HOST_OUT_HEADERS := $(HOST_OUT_INTERMEDIATES)/include
 HOST_OUT_INTERMEDIATE_LIBRARIES := $(HOST_OUT_INTERMEDIATES)/lib
 HOST_OUT_NOTICE_FILES := $(HOST_OUT_INTERMEDIATES)/NOTICE_FILES
 HOST_OUT_COMMON_INTERMEDIATES := $(HOST_COMMON_OUT_ROOT)/obj
@@ -279,7 +278,6 @@
 include $(BUILD_SYSTEM)/aux_config.mk
 
 HOST_CROSS_OUT_INTERMEDIATES := $(HOST_CROSS_OUT)/obj
-HOST_CROSS_OUT_HEADERS := $(HOST_CROSS_OUT_INTERMEDIATES)/include
 HOST_CROSS_OUT_INTERMEDIATE_LIBRARIES := $(HOST_CROSS_OUT_INTERMEDIATES)/lib
 HOST_CROSS_OUT_NOTICE_FILES := $(HOST_CROSS_OUT_INTERMEDIATES)/NOTICE_FILES