diff --git a/core/binary.mk b/core/binary.mk
index 2538a93..e2f6e00 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -1738,7 +1738,14 @@
 # Export includes
 ###########################################################
 export_includes := $(intermediates)/export_includes
-$(export_includes): PRIVATE_EXPORT_C_INCLUDE_DIRS := $(my_export_c_include_dirs)
+export_cflags := $(foreach d,$(my_export_c_include_dirs),-I $(d))
+# Soong exports cflags instead of include dirs, so that -isystem can be included.
+ifeq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
+export_cflags += $(LOCAL_EXPORT_CFLAGS)
+else ifdef LOCAL_EXPORT_CFLAGS
+$(call pretty-error,LOCAL_EXPORT_CFLAGS can only be used by Soong, use LOCAL_EXPORT_C_INCLUDE_DIRS instead)
+endif
+$(export_includes): PRIVATE_EXPORT_CFLAGS := $(export_cflags)
 # Headers exported by whole static libraries are also exported by this library.
 export_include_deps := $(strip \
    $(foreach l,$(my_whole_static_libraries), \
@@ -1761,10 +1768,8 @@
 $(export_includes) : $(my_export_c_include_deps) $(my_generated_sources) $(export_include_deps) $(LOCAL_EXPORT_C_INCLUDE_DEPS)
 	@echo Export includes file: $< -- $@
 	$(hide) mkdir -p $(dir $@) && rm -f $@.tmp && touch $@.tmp
-ifdef my_export_c_include_dirs
-	$(hide) for d in $(PRIVATE_EXPORT_C_INCLUDE_DIRS); do \
-	        echo "-I $$d" >> $@.tmp; \
-	        done
+ifdef export_cflags
+	$(hide) echo "$(PRIVATE_EXPORT_CFLAGS)" >>$@.tmp
 endif
 ifdef export_include_deps
 	$(hide) for f in $(PRIVATE_REEXPORTED_INCLUDES); do \
@@ -1776,6 +1781,7 @@
 	else \
 	  mv $@.tmp $@ ; \
 	fi
+export_cflags :=
 
 # Kati adds restat=1 to ninja. GNU make does nothing for this.
 .KATI_RESTAT: $(export_includes)
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index 257f3f9..85431f5 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -68,6 +68,7 @@
 LOCAL_DX_FLAGS:=
 LOCAL_EMMA_COVERAGE_FILTER:=
 LOCAL_EMMA_INSTRUMENT:=
+LOCAL_EXPORT_CFLAGS:=
 LOCAL_EXPORT_C_INCLUDE_DEPS:=
 LOCAL_EXPORT_C_INCLUDE_DIRS:=
 LOCAL_EXPORT_HEADER_LIBRARY_HEADERS:=
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 997f971..03f7cc7 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -126,17 +126,23 @@
 
 ifdef prebuilt_module_is_a_library
 export_includes := $(intermediates)/export_includes
-$(export_includes): PRIVATE_EXPORT_C_INCLUDE_DIRS := $(LOCAL_EXPORT_C_INCLUDE_DIRS)
+export_cflags := $(foreach d,$(LOCAL_EXPORT_C_INCLUDE_DIRS),-I $(d))
+# Soong exports cflags instead of include dirs, so that -isystem can be included.
+ifeq ($(LOCAL_MODULE_MAKEFILE),$(SOONG_ANDROID_MK))
+export_cflags += $(LOCAL_EXPORT_CFLAGS)
+else ifdef LOCAL_EXPORT_CFLAGS
+$(call pretty-error,LOCAL_EXPORT_CFLAGS can only be used by Soong, use LOCAL_EXPORT_C_INCLUDE_DIRS instead)
+endif
+$(export_includes): PRIVATE_EXPORT_CFLAGS := $(export_cflags)
 $(export_includes): $(LOCAL_EXPORT_C_INCLUDE_DEPS)
 	@echo Export includes file: $< -- $@
 	$(hide) mkdir -p $(dir $@) && rm -f $@
-ifdef LOCAL_EXPORT_C_INCLUDE_DIRS
-	$(hide) for d in $(PRIVATE_EXPORT_C_INCLUDE_DIRS); do \
-	        echo "-I $$d" >> $@; \
-	        done
+ifdef export_cflags
+	$(hide) echo "$(PRIVATE_EXPORT_CFLAGS)" >$@
 else
 	$(hide) touch $@
 endif
+export_cflags :=
 
 my_link_type := $(intermediates)/link_type
 $(my_link_type): PRIVATE_LINK_TYPE := native:$(if $(LOCAL_SDK_VERSION),ndk,platform)