--- /dev/null
+D := util/ego
+
+define build-ego-backend-impl
+
+$(call reset)
+$(eval cflags += -DVERBOSE -DNOTCOMPACT)
+$(eval cflags += -I$D/share -I$(OBJDIR)/$D)
+$(foreach f, $2, $(call cfile, $f))
+$(call file, $(LIBDIR)/libegocore.a)
+$(call file, $(LIBEM_DATA))
+$(call cprogram, $(BINDIR)/ego/$(strip $1))
+$(call installto, $(PLATDEP)/ego/$(strip $1))
+$(eval EGO_MODULES += $q)
+
+endef
+
+define build-ego-impl
+
+# Generated files that egocore needs.
+
+$(call reset)
+$(call cfile, $D/share/makecldef.c)
+$(call cprogram, $(OBJDIR)/$D/makecldef)
+
+$(eval g := $(OBJDIR)/$D/classdefs.h)
+$(eval CLEANABLES += $g)
+$g: $(OBJDIR)/$D/makecldef $(INCDIR)/em_mnem.h $D/share/cldefs.src
+ @echo MAKECLDEF $g
+ @mkdir -p $(dir $g)
+ $(hide) $$^ > $g
+
+$(eval g := $(OBJDIR)/$D/pop_push.h)
+$(eval CLEANABLES += $g)
+$g: $D/share/pop_push.awk h/em_table
+ @echo POP_PUSH $g
+ @mkdir -p $(dir $g)
+ $(hide) awk -f $D/share/pop_push.awk < h/em_table > $g
+
+# Build the egocore library.
+
+$(call reset)
+$(eval cflags += -I$D/share -I$(OBJDIR)/$D)
+$(eval cflags += -DVERBOSE -DNOTCOMPACT)
+
+$(call cfile, $D/share/debug.c)
+$(call cfile, $D/share/global.c)
+$(call cfile, $D/share/files.c)
+$(call cfile, $D/share/go.c)
+$(call cfile, $D/share/map.c)
+$(call cfile, $D/share/aux.c)
+$(call cfile, $D/share/get.c)
+$(call cfile, $D/share/put.c)
+$(call cfile, $D/share/alloc.c)
+$(call cfile, $D/share/lset.c)
+$(call cfile, $D/share/cset.c)
+$(call cfile, $D/share/parser.c)
+$(call cfile, $D/share/stack_chg.c)
+$(call cfile, $D/share/locals.c)
+$(call cfile, $D/share/init_glob.c)
+$(eval $q: $(OBJDIR)/$D/classdefs.h $(OBJDIR)/$D/pop_push.h)
+
+$(call clibrary, $(LIBDIR)/libegocore.a)
+$(eval CLEANABLES += $q)
+
+# Now build each of the back ends.
+
+$(call build-ego-backend-impl, bo, \
+ $D/bo/bo.c)
+
+$(call build-ego-backend-impl, ca, \
+ $D/ca/ca.c \
+ $D/ca/ca_put.c)
+
+$(call build-ego-backend-impl, cf, \
+ $D/cf/cf.c \
+ $D/cf/cf_idom.c \
+ $D/cf/cf_loop.c \
+ $D/cf/cf_succ.c)
+
+$(call build-ego-backend-impl, cj, \
+ $D/cj/cj.c)
+
+$(call build-ego-backend-impl, cs, \
+ $D/cs/cs.c \
+ $D/cs/cs_alloc.c \
+ $D/cs/cs_aux.c \
+ $D/cs/cs_avail.c \
+ $D/cs/cs_debug.c \
+ $D/cs/cs_elim.c \
+ $D/cs/cs_entity.c \
+ $D/cs/cs_getent.c \
+ $D/cs/cs_kill.c \
+ $D/cs/cs_partit.c \
+ $D/cs/cs_profit.c \
+ $D/cs/cs_stack.c \
+ $D/cs/cs_vnm.c)
+
+$(call build-ego-backend-impl, ic, \
+ $D/ic/ic.c \
+ $D/ic/ic_aux.c \
+ $D/ic/ic_io.c \
+ $D/ic/ic_lib.c \
+ $D/ic/ic_lookup.c)
+
+$(call build-ego-backend-impl, il, \
+ $D/il/il.c \
+ $D/il/il1_anal.c \
+ $D/il/il1_aux.c \
+ $D/il/il1_cal.c \
+ $D/il/il1_formal.c \
+ $D/il/il2_aux.c \
+ $D/il/il3_aux.c \
+ $D/il/il3_change.c \
+ $D/il/il3_subst.c \
+ $D/il/il_aux.c)
+
+$(call build-ego-backend-impl, lv, \
+ $D/lv/lv.c)
+
+$(call build-ego-backend-impl, ra, \
+ $D/ra/ra.c \
+ $D/ra/ra_allocl.c \
+ $D/ra/ra_aux.c \
+ $D/ra/ra_interv.c \
+ $D/ra/ra_lifet.c \
+ $D/ra/ra_pack.c \
+ $D/ra/ra_profits.c \
+ $D/ra/ra_xform.c \
+ $D/ra/ra_items.c)
+
+$(eval g := $(OBJDIR)/$D/itemtab.h)
+$(eval CLEANABLES += $g)
+$D/ra/ra_items.c: $g
+$g: $(OBJDIR)/$D/makeitems $(INCDIR)/em_mnem.h $D/ra/itemtab.src
+ @echo MAKEITEMS $g
+ @mkdir -p $(dir $g)
+ $(hide) $$^ > $g
+
+$(call reset)
+$(call cfile, $D/ra/makeitems.c)
+$(call cprogram, $(OBJDIR)/$D/makeitems)
+
+$(call build-ego-backend-impl, sp, \
+ $D/sp/sp.c)
+
+$(call build-ego-backend-impl, sr, \
+ $D/sr/sr.c \
+ $D/sr/sr_aux.c \
+ $D/sr/sr_cand.c \
+ $D/sr/sr_expr.c \
+ $D/sr/sr_iv.c \
+ $D/sr/sr_reduce.c \
+ $D/sr/sr_xform.c)
+
+$(call build-ego-backend-impl, ud, \
+ $D/ud/ud.c \
+ $D/ud/ud_aux.c \
+ $D/ud/ud_const.c \
+ $D/ud/ud_copy.c \
+ $D/ud/ud_defs.c)
+
+# ...and now the front end, which depends on all the backends.
+
+$(call reset)
+$(call cfile, $D/em_ego/em_ego.c)
+$(eval $q: $(INCDIR)/print.h $(INCDIR)/system.h)
+$(eval $q: $(INCDIR)/em_path.h)
+
+$(call file, $(LIBPRINT))
+$(call file, $(LIBSTRING))
+$(call file, $(LIBSYSTEM))
+
+$(call cprogram, $(BINDIR)/em_ego)
+$(call installto, $(PLATDEP)/em_ego)
+$(eval EM_EGO := $q)
+$(eval $q: $(EGO_MODULES))
+$(eval ACK_CORE_TOOLS += $q)
+
+endef
+
+$(eval $(build-ego-impl))
+
+# Install the ego descr file for the current architecture, if one exists.
+# This is a bit annoying because it's called by each platform, so we need
+# to protect against the architecture being seen more than once. And some
+# architectures don't get descr files.
+
+define build-ego-descr-impl
+
+$(eval EGO_DESCR_$(ARCH) := 1)
+
+$(eval g := $(PLATIND)/ego/$(ARCH).descr)
+$(eval CLEANABLES += $g)
+$(eval $(EM_EGO): $g)
+$g: util/ego/descr/descr.sed util/ego/descr/$(ARCH).descr $(CPPANSI) \
+ $(INCDIR)/em_mnem.h
+ @echo EGODESCR $g
+ @mkdir -p $(dir $g)
+ $(hide) $(CPPANSI) -P -I$(INCDIR) util/ego/descr/$(ARCH).descr | sed -f util/ego/descr/descr.sed > $g
+
+endef
+
+build-ego-descr = $(if $(EGO_DESCR_$(ARCH)),, \
+ $(if $(wildcard util/ego/descr/$(ARCH).descr), \
+ $(eval $(call build-ego-descr-impl, $1))))
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