diff --git a/core/base_rules.mk b/core/base_rules.mk
index 40e546e..1d3f57e 100644
--- a/core/base_rules.mk
+++ b/core/base_rules.mk
@@ -56,7 +56,6 @@
   my_module_tags :=
 endif
 
-ifdef BUILDING_WITH_NINJA
 # Ninja has an implicit dependency on the command being run, and kati will
 # regenerate the ninja manifest if any read makefile changes, so there is no
 # need to have dependencies on makefiles.
@@ -64,7 +63,6 @@
 # a .mk file, because a few users of LOCAL_ADDITIONAL_DEPENDENCIES don't include
 # base_rules.mk, but it will fix the most common ones.
 LOCAL_ADDITIONAL_DEPENDENCIES := $(filter-out %.mk,$(LOCAL_ADDITIONAL_DEPENDENCIES))
-endif
 
 ###########################################################
 ## Validate and define fallbacks for input LOCAL_* variables.
diff --git a/core/binary.mk b/core/binary.mk
index aab1248..c6c2708 100644
--- a/core/binary.mk
+++ b/core/binary.mk
@@ -53,7 +53,7 @@
 my_c_includes := $(LOCAL_C_INCLUDES)
 my_generated_sources := $(LOCAL_GENERATED_SOURCES)
 my_native_coverage := $(LOCAL_NATIVE_COVERAGE)
-my_additional_dependencies := $(LOCAL_MODULE_MAKEFILE_DEP) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+my_additional_dependencies := $(LOCAL_ADDITIONAL_DEPENDENCIES)
 my_export_c_include_dirs := $(LOCAL_EXPORT_C_INCLUDE_DIRS)
 
 ifdef LOCAL_IS_HOST_MODULE
@@ -1143,7 +1143,7 @@
     $(foreach l, $(my_static_libraries) $(my_whole_static_libraries), \
       $(call intermediates-dir-for,STATIC_LIBRARIES,$(l),$(LOCAL_IS_HOST_MODULE),,$(LOCAL_2ND_ARCH_VAR_PREFIX),$(my_host_cross))/export_includes))
 $(import_includes): PRIVATE_IMPORT_EXPORT_INCLUDES := $(import_includes_deps)
-$(import_includes) : $(LOCAL_MODULE_MAKEFILE_DEP) $(import_includes_deps)
+$(import_includes) : $(import_includes_deps)
 	@echo Import includes file: $@
 	$(hide) mkdir -p $(dir $@) && rm -f $@
 ifdef import_includes_deps
@@ -1210,11 +1210,7 @@
 # that custom build rules which generate .o files don't consume other generated
 # sources as input (or if they do they take care of that dependency themselves).
 $(normal_objects) : | $(my_generated_sources)
-ifeq ($(BUILDING_WITH_NINJA),true)
 $(all_objects) : $(import_includes)
-else
-$(all_objects) : | $(import_includes)
-endif
 ALL_C_CPP_ETC_OBJECTS += $(all_objects)
 
 
@@ -1406,7 +1402,7 @@
 # Similarly, the generated DBus headers need to exist before we export their location.
 # People are not going to consume the aidl generated cpp file, but the cpp file is
 # generated after the headers, so this is a convenient way to ensure the headers exist.
-$(export_includes) : $(LOCAL_MODULE_MAKEFILE_DEP) $(proto_generated_headers) $(dbus_generated_headers) $(aidl_gen_cpp)
+$(export_includes) : $(proto_generated_headers) $(dbus_generated_headers) $(aidl_gen_cpp)
 	@echo Export includes file: $< -- $@
 	$(hide) mkdir -p $(dir $@) && rm -f $@.tmp
 ifdef my_export_c_include_dirs
@@ -1416,15 +1412,11 @@
 else
 	$(hide) touch $@.tmp
 endif
-ifeq ($(BUILDING_WITH_NINJA),true)
 	$(hide) if cmp -s $@.tmp $@ ; then \
 	  rm $@.tmp ; \
 	else \
 	  mv $@.tmp $@ ; \
 	fi
-else
-	mv $@.tmp $@ ;
-endif
 
 # Kati adds restat=1 to ninja. GNU make does nothing for this.
 .KATI_RESTAT: $(export_includes)
diff --git a/core/definitions.mk b/core/definitions.mk
index c40e6bc..5c76d77 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -133,7 +133,6 @@
 define my-dir
 $(strip \
   $(eval LOCAL_MODULE_MAKEFILE := $$(lastword $$(MAKEFILE_LIST))) \
-  $(eval LOCAL_MODULE_MAKEFILE_DEP := $(if $(BUILDING_WITH_NINJA),,$$(LOCAL_MODULE_MAKEFILE))) \
   $(if $(filter $(BUILD_SYSTEM)/% $(OUT_DIR)/%,$(LOCAL_MODULE_MAKEFILE)), \
     $(error my-dir must be called before including any other makefile.) \
    , \
@@ -895,15 +894,9 @@
 ###########################################################
 # $(1): the .P file
 # $(2): the main build target
-ifeq ($(BUILDING_WITH_NINJA),true)
 define include-depfile
 $(eval $(2) : .KATI_DEPFILE := $1)
 endef
-else
-define include-depfile
-$(eval -include $1)
-endef
-endif
 
 ###########################################################
 ## Track source files compiled to objects
@@ -2025,9 +2018,7 @@
 # Moves $1.tmp to $1 if necessary. This is designed to be used with
 # .KATI_RESTAT. For kati, this function doesn't update the timestamp
 # of $1 when $1.tmp is identical to $1 so that ninja won't rebuild
-# targets which depend on $1. For GNU make, this function simply
-# copies $1.tmp to $1.
-ifeq ($(BUILDING_WITH_NINJA),true)
+# targets which depend on $1.
 define commit-change-for-toc
 $(hide) if cmp -s $1.tmp $1 ; then \
  rm $1.tmp ; \
@@ -2035,12 +2026,6 @@
  mv $1.tmp $1 ; \
 fi
 endef
-else
-define commit-change-for-toc
-@# make doesn't support restat. We always update .toc files so the dependents will always be updated too.
-$(hide) mv $1.tmp $1
-endef
-endif
 
 ## Rule to create a table of contents from a .jar file.
 ## Must be called with $(eval).
diff --git a/core/droiddoc.mk b/core/droiddoc.mk
index 1b65611..0f18a58 100644
--- a/core/droiddoc.mk
+++ b/core/droiddoc.mk
@@ -161,7 +161,6 @@
         $(droiddoc) \
         $(html_dir_files) \
         $(full_java_lib_deps) \
-        $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	@echo Docs droiddoc: $(PRIVATE_OUT_DIR)
 	$(hide) mkdir -p $(dir $@)
diff --git a/core/executable_prefer_symlink.mk b/core/executable_prefer_symlink.mk
index 931550f..1640b32 100644
--- a/core/executable_prefer_symlink.mk
+++ b/core/executable_prefer_symlink.mk
@@ -42,7 +42,7 @@
 # $(my_symlink) doesn't need to depend on $(PRIVATE_SRC_BINARY_NAME): we can generate symlink to nonexistent file.
 # If you add the dependency, make would compare the timestamp of a file against that of its symlink:
 # they are always equal, because make follows symlink.
-$(my_symlink): $(LOCAL_MODULE_MAKEFILE_DEP)
+$(my_symlink):
 	@echo "Symlink: $@ -> $(PRIVATE_SRC_BINARY_NAME)"
 	@mkdir -p $(dir $@)
 	@rm -rf $@
diff --git a/core/goma.mk b/core/goma.mk
index 6535b3e..982160b 100644
--- a/core/goma.mk
+++ b/core/goma.mk
@@ -16,16 +16,6 @@
 
 # Notice: this works only with Google's Goma build infrastructure.
 ifneq ($(filter-out false,$(USE_GOMA)),)
-  # Check if USE_NINJA is not false because GNU make won't work well
-  # with goma. Note this file is evaluated twice, once by GNU make and
-  # once by kati with USE_NINJA=false. We do this check in the former
-  # pass.
-  ifndef KATI
-    ifeq ($(USE_NINJA),false)
-      $(error USE_GOMA=true is not compatible with USE_NINJA=false)
-    endif
-  endif
-
   # Goma requires a lot of processes and file descriptors.
   ifeq ($(shell echo $$(($$(ulimit -u) < 2500 || $$(ulimit -n) < 16000))),1)
     $(warning Max user processes and/or open files are insufficient)
diff --git a/core/host_dalvik_java_library.mk b/core/host_dalvik_java_library.mk
index c506969..6678723 100644
--- a/core/host_dalvik_java_library.mk
+++ b/core/host_dalvik_java_library.mk
@@ -76,7 +76,6 @@
         $(full_java_lib_deps) \
         $(jar_manifest_file) \
         $(proto_java_sources_file_stamp) \
-        $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-host-java-to-package)
 
@@ -126,7 +125,7 @@
 $(built_dex): PRIVATE_JACK_FLAGS := $(GLOBAL_JAVAC_DEBUG_FLAGS) $(LOCAL_JACK_FLAGS)
 $(built_dex): PRIVATE_JACK_VERSION := $(LOCAL_JACK_VERSION)
 $(built_dex): $(java_sources) $(java_resource_sources) $(full_jack_deps) \
-        $(jar_manifest_file) $(proto_java_sources_file_stamp) $(LOCAL_MODULE_MAKEFILE_DEP) \
+        $(jar_manifest_file) $(proto_java_sources_file_stamp) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES) $(JACK) | setup-jack-server
 	@echo Building with Jack: $@
 	$(jack-java-to-dex)
diff --git a/core/host_dalvik_static_java_library.mk b/core/host_dalvik_static_java_library.mk
index e6638be..e1ffbfe 100644
--- a/core/host_dalvik_static_java_library.mk
+++ b/core/host_dalvik_static_java_library.mk
@@ -48,7 +48,7 @@
 	PRIVATE_JACK_INCREMENTAL_DIR :=
 endif
 $(full_classes_jack): $(java_sources) $(java_resource_sources) $(full_jack_deps) \
-        $(jar_manifest_file) $(layers_file) $(LOCAL_MODULE_MAKEFILE_DEP) \
+        $(jar_manifest_file) $(layers_file) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES) $(LOCAL_JARJAR_RULES) \
         $(JACK) | setup-jack-server
 	@echo Building with Jack: $@
diff --git a/core/host_java_library.mk b/core/host_java_library.mk
index 052c571..fb69f63 100644
--- a/core/host_java_library.mk
+++ b/core/host_java_library.mk
@@ -88,6 +88,5 @@
         $(full_java_lib_deps) \
         $(jar_manifest_file) \
         $(proto_java_sources_file_stamp) \
-        $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-host-java-to-package)
diff --git a/core/host_shared_library_internal.mk b/core/host_shared_library_internal.mk
index 272e76f..bfbde21 100644
--- a/core/host_shared_library_internal.mk
+++ b/core/host_shared_library_internal.mk
@@ -44,7 +44,6 @@
 $(LOCAL_BUILT_MODULE): \
         $(all_objects) \
         $(all_libraries) \
-        $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-host-o-to-shared-lib)
 
diff --git a/core/java.mk b/core/java.mk
index 705860b..4485af6 100644
--- a/core/java.mk
+++ b/core/java.mk
@@ -304,7 +304,6 @@
 
 $(aidl_java_sources): $(intermediates.COMMON)/src/%.java: \
         $(LOCAL_PATH)/%.aidl \
-        $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES) \
         $(AIDL) \
         $(aidl_preprocess_import)
@@ -413,7 +412,6 @@
         $(layers_file) \
         $(RenderScript_file_stamp) \
         $(proto_java_sources_file_stamp) \
-        $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-java-to-classes.jar)
 
@@ -665,7 +663,7 @@
 jack_all_deps := $(java_sources) $(java_resource_sources) $(full_jack_deps) \
         $(jar_manifest_file) $(layers_file) $(RenderScript_file_stamp) $(proguard_flag_files) \
         $(proto_java_sources_file_stamp) $(LOCAL_ADDITIONAL_DEPENDENCIES) $(LOCAL_JARJAR_RULES) \
-        $(LOCAL_MODULE_MAKEFILE_DEP) $(JACK)
+        $(JACK)
 
 ifeq ($(LOCAL_IS_STATIC_JAVA_LIBRARY),true)
 $(full_classes_jack): $(jack_all_deps) | setup-jack-server
diff --git a/core/main.mk b/core/main.mk
index ac71867..85f9117 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -96,22 +96,15 @@
 # and host information.
 include $(BUILD_SYSTEM)/config.mk
 
-relaunch_with_ninja :=
-ifneq ($(USE_NINJA),false)
-ifndef BUILDING_WITH_NINJA
-relaunch_with_ninja := true
-endif
+ifndef KATI
+ifdef USE_NINJA
+$(warning USE_NINJA is ignored. Ninja is always used.)
 endif
 
-ifeq ($(relaunch_with_ninja),true)
 # Mark this is a ninja build.
 $(shell mkdir -p $(OUT_DIR) && touch $(OUT_DIR)/ninja_build)
 include build/core/ninja.mk
-else # !relaunch_with_ninja
-ifndef BUILDING_WITH_NINJA
-# Remove ninja build mark if it exists.
-$(shell rm -f $(OUT_DIR)/ninja_build)
-endif
+else # KATI
 
 # With these files findleaves.py won't be unnecessarily slower even if
 # there is a user creates a copy of $(OUT_DIR).
@@ -1120,4 +1113,4 @@
 .PHONY: nothing
 nothing:
 	@echo Successfully read the makefiles.
-endif # !relaunch_with_ninja
+endif # KATI
diff --git a/core/phony_package.mk b/core/phony_package.mk
index 866b13c..b534335 100644
--- a/core/phony_package.mk
+++ b/core/phony_package.mk
@@ -7,7 +7,7 @@
 
 include $(BUILD_SYSTEM)/base_rules.mk
 
-$(LOCAL_BUILT_MODULE): $(LOCAL_MODULE_MAKEFILE_DEP) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+$(LOCAL_BUILT_MODULE): $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(hide) echo "Fake: $@"
 	$(hide) mkdir -p $(dir $@)
 	$(hide) touch $@
diff --git a/core/prebuilt_internal.mk b/core/prebuilt_internal.mk
index 286670b..1422809 100644
--- a/core/prebuilt_internal.mk
+++ b/core/prebuilt_internal.mk
@@ -95,7 +95,7 @@
 ifdef prebuilt_module_is_a_library
 export_includes := $(intermediates)/export_includes
 $(export_includes): PRIVATE_EXPORT_C_INCLUDE_DIRS := $(LOCAL_EXPORT_C_INCLUDE_DIRS)
-$(export_includes) : $(LOCAL_MODULE_MAKEFILE_DEP)
+$(export_includes) :
 	@echo Export includes file: $< -- $@
 	$(hide) mkdir -p $(dir $@) && rm -f $@
 ifdef LOCAL_EXPORT_C_INCLUDE_DIRS
@@ -330,7 +330,7 @@
 
 # We may be building classes.jack from a host jar for host dalvik Java library.
 $(intermediates.COMMON)/classes.jack : PRIVATE_JACK_FLAGS:=$(LOCAL_JACK_FLAGS)
-$(intermediates.COMMON)/classes.jack : $(my_src_jar) $(LOCAL_MODULE_MAKEFILE_DEP) \
+$(intermediates.COMMON)/classes.jack : $(my_src_jar) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES) $(JACK) | setup-jack-server
 	$(transform-jar-to-jack)
 
@@ -341,6 +341,6 @@
 
 endif # JAVA_LIBRARIES
 
-$(built_module) : $(LOCAL_MODULE_MAKEFILE_DEP) $(LOCAL_ADDITIONAL_DEPENDENCIES)
+$(built_module) : $(LOCAL_ADDITIONAL_DEPENDENCIES)
 
 my_prebuilt_src_file :=
diff --git a/core/shared_library_internal.mk b/core/shared_library_internal.mk
index b9a5e3e..6fec460 100644
--- a/core/shared_library_internal.mk
+++ b/core/shared_library_internal.mk
@@ -76,7 +76,6 @@
         $(all_libraries) \
         $(my_target_crtbegin_so_o) \
         $(my_target_crtend_so_o) \
-        $(LOCAL_MODULE_MAKEFILE_DEP) \
         $(LOCAL_ADDITIONAL_DEPENDENCIES)
 	$(transform-o-to-shared-lib)