--- a/client.mk
+++ b/client.mk
@@ -169,17 +169,17 @@ MOZ_MAKE = $(MAKE) $(MOZ_MAKE_FLAGS) -C 
 
 endif # MOZ_BUILD_PROJECTS
 
 # 'configure' scripts generated by autoconf.
 CONFIGURES := $(TOPSRCDIR)/configure
 CONFIGURES += $(TOPSRCDIR)/js/src/configure
 
 # Make targets that are going to be passed to the real build system
-OBJDIR_TARGETS = install export libs clean realclean distclean alldep maybe_clobber_profiledbuild upload sdk installer package fast-package package-compare stage-package source-package l10n-check
+OBJDIR_TARGETS = install export libs clean realclean distclean maybe_clobber_profiledbuild upload sdk installer package fast-package package-compare stage-package source-package l10n-check
 
 #######################################################################
 # Rules
 
 # The default rule is build
 build::
 	$(MAKE) -f $(TOPSRCDIR)/client.mk $(if $(MOZ_PGO),profiledbuild,realbuild)
 
@@ -206,26 +206,24 @@ ifdef WANT_MOZCONFIG_MK
 
 # Include that makefile so that it is created. This should not actually change
 # the environment since MOZCONFIG_CONTENT, which MOZCONFIG_OUT_LINES derives
 # from, has already been eval'ed.
 -include $(OBJDIR)/.mozconfig.mk
 endif
 
 # Print out any options loaded from mozconfig.
-all realbuild clean depend distclean export libs install realclean::
+all realbuild clean distclean export libs install realclean::
 ifneq (,$(strip $(MOZCONFIG_OUT_FILTERED)))
 	$(info Adding client.mk options from $(FOUND_MOZCONFIG):)
 	$(foreach line,$(MOZCONFIG_OUT_FILTERED),$(info $(NULL) $(NULL) $(NULL) $(NULL) $(subst ||, ,$(line))))
 endif
 
 # Windows equivalents
 build_all: build
-build_all_dep: alldep
-build_all_depend: alldep
 clobber clobber_all: clean
 
 # helper target for mobile
 build_and_deploy: build fast-package install
 
 # Do everything from scratch
 everything: clean build
 
@@ -258,17 +256,17 @@ MOZ_BUILD_DATE = $(shell $(PYTHON) $(TOP
 export MOZ_BUILD_DATE
 endif
 endif
 endif
 
 #####################################################
 # Preflight, before building any project
 
-realbuild alldep preflight_all::
+realbuild preflight_all::
 ifeq (,$(MOZ_CURRENT_PROJECT)$(if $(MOZ_PREFLIGHT_ALL),,1))
 # Don't run preflight_all for individual projects in multi-project builds
 # (when MOZ_CURRENT_PROJECT is set.)
 ifndef MOZ_BUILD_PROJECTS
 # Building a single project, OBJDIR is usable.
 	set -e; \
 	for mkfile in $(MOZ_PREFLIGHT_ALL); do \
 	  $(MAKE) -f $(TOPSRCDIR)/$$mkfile preflight_all TOPSRCDIR=$(TOPSRCDIR) OBJDIR=$(OBJDIR) MOZ_OBJDIR=$(MOZ_OBJDIR); \
@@ -282,17 +280,17 @@ else
 	done
 endif
 endif
 
 # If we're building multiple projects, but haven't specified which project,
 # loop through them.
 
 ifeq (,$(MOZ_CURRENT_PROJECT)$(if $(MOZ_BUILD_PROJECTS),,1))
-configure depend realbuild preflight postflight $(OBJDIR_TARGETS)::
+configure realbuild preflight postflight $(OBJDIR_TARGETS)::
 	set -e; \
 	for app in $(MOZ_BUILD_PROJECTS); do \
 	  $(MAKE) -f $(TOPSRCDIR)/client.mk $@ MOZ_CURRENT_PROJECT=$$app; \
 	done
 
 else
 
 # MOZ_CURRENT_PROJECT: either doing a single-project build, or building an
@@ -378,25 +376,19 @@ endif
 
 ifneq (,$(CONFIG_STATUS))
 $(OBJDIR)/config/autoconf.mk: $(TOPSRCDIR)/config/autoconf.mk.in
 	$(PYTHON) $(OBJDIR)/config.status -n --file=$(OBJDIR)/config/autoconf.mk
 endif
 
 
 ####################################
-# Depend
-
-depend:: $(OBJDIR)/Makefile $(OBJDIR)/config.status
-	$(MOZ_MAKE) export && $(MOZ_MAKE) depend
-
-####################################
 # Preflight
 
-realbuild alldep preflight::
+realbuild preflight::
 ifdef MOZ_PREFLIGHT
 	set -e; \
 	for mkfile in $(MOZ_PREFLIGHT); do \
 	  $(MAKE) -f $(TOPSRCDIR)/$$mkfile preflight TOPSRCDIR=$(TOPSRCDIR) OBJDIR=$(OBJDIR) MOZ_OBJDIR=$(MOZ_OBJDIR); \
 	done
 endif
 
 ####################################
@@ -410,30 +402,30 @@ realbuild::  $(OBJDIR)/Makefile $(OBJDIR
 
 # Pass these target onto the real build system
 $(OBJDIR_TARGETS):: $(OBJDIR)/Makefile $(OBJDIR)/config.status
 	$(MOZ_MAKE) $@
 
 ####################################
 # Postflight
 
-realbuild alldep postflight::
+realbuild postflight::
 ifdef MOZ_POSTFLIGHT
 	set -e; \
 	for mkfile in $(MOZ_POSTFLIGHT); do \
 	  $(MAKE) -f $(TOPSRCDIR)/$$mkfile postflight TOPSRCDIR=$(TOPSRCDIR) OBJDIR=$(OBJDIR) MOZ_OBJDIR=$(MOZ_OBJDIR); \
 	done
 endif
 
 endif # MOZ_CURRENT_PROJECT
 
 ####################################
 # Postflight, after building all projects
 
-realbuild alldep postflight_all::
+realbuild postflight_all::
 ifeq (,$(MOZ_CURRENT_PROJECT)$(if $(MOZ_POSTFLIGHT_ALL),,1))
 # Don't run postflight_all for individual projects in multi-project builds
 # (when MOZ_CURRENT_PROJECT is set.)
 ifndef MOZ_BUILD_PROJECTS
 # Building a single project, OBJDIR is usable.
 	set -e; \
 	for mkfile in $(MOZ_POSTFLIGHT_ALL); do \
 	  $(MAKE) -f $(TOPSRCDIR)/$$mkfile postflight_all TOPSRCDIR=$(TOPSRCDIR) OBJDIR=$(OBJDIR) MOZ_OBJDIR=$(MOZ_OBJDIR); \
@@ -484,17 +476,16 @@ echo-variable-%:
 
 # This makefile doesn't support parallel execution. It does pass
 # MOZ_MAKE_FLAGS to sub-make processes, so they will correctly execute
 # in parallel.
 .NOTPARALLEL:
 
 .PHONY: checkout \
     real_checkout \
-    depend \
     realbuild \
     build \
     profiledbuild \
     cleansrcdir \
     pull_all \
     build_all \
     check-clobber \
     clobber \

--- a/config/rules.mk
+++ b/config/rules.mk
@@ -681,42 +681,31 @@ SUBMAKEFILES += $(addsuffix /Makefile, $
 # of something else. Makefiles which use this var *must* provide a sensible
 # default rule before including rules.mk
 ifndef SUPPRESS_DEFAULT_RULES
 ifndef TIERS
 default all::
 	$(MAKE) export
 	$(MAKE) libs
 	$(MAKE) tools
-
-# Do depend as well
-alldep::
-	$(MAKE) export
-	$(MAKE) depend
-	$(MAKE) libs
-	$(MAKE) tools
-
 endif # TIERS
 endif # SUPPRESS_DEFAULT_RULES
 
 ifeq ($(findstring s,$(filter-out --%, $(MAKEFLAGS))),)
 ECHO := echo
 QUIET :=
 else
 ECHO := true
 QUIET := -q
 endif
 
 # Do everything from scratch
 everything::
 	$(MAKE) clean
-	$(MAKE) alldep
-
-# Add dummy depend target for tinderboxes
-depend::
+	$(MAKE) all
 
 # Target to only regenerate makefiles
 makefiles: $(SUBMAKEFILES)
 ifneq (,$(DIRS)$(TOOL_DIRS)$(PARALLEL_DIRS))
 	$(LOOP_OVER_PARALLEL_DIRS)
 	$(LOOP_OVER_DIRS)
 	$(LOOP_OVER_TOOL_DIRS)
 endif

--- a/js/src/config/rules.mk
+++ b/js/src/config/rules.mk
@@ -681,42 +681,31 @@ SUBMAKEFILES += $(addsuffix /Makefile, $
 # of something else. Makefiles which use this var *must* provide a sensible
 # default rule before including rules.mk
 ifndef SUPPRESS_DEFAULT_RULES
 ifndef TIERS
 default all::
 	$(MAKE) export
 	$(MAKE) libs
 	$(MAKE) tools
-
-# Do depend as well
-alldep::
-	$(MAKE) export
-	$(MAKE) depend
-	$(MAKE) libs
-	$(MAKE) tools
-
 endif # TIERS
 endif # SUPPRESS_DEFAULT_RULES
 
 ifeq ($(findstring s,$(filter-out --%, $(MAKEFLAGS))),)
 ECHO := echo
 QUIET :=
 else
 ECHO := true
 QUIET := -q
 endif
 
 # Do everything from scratch
 everything::
 	$(MAKE) clean
-	$(MAKE) alldep
-
-# Add dummy depend target for tinderboxes
-depend::
+	$(MAKE) all
 
 # Target to only regenerate makefiles
 makefiles: $(SUBMAKEFILES)
 ifneq (,$(DIRS)$(TOOL_DIRS)$(PARALLEL_DIRS))
 	$(LOOP_OVER_PARALLEL_DIRS)
 	$(LOOP_OVER_DIRS)
 	$(LOOP_OVER_TOOL_DIRS)
 endif