diff --git a/build/Makefile b/build/Makefile
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+#
+# Makefile for building the unix kernel and disk images.
+#
+# important targets:
+#	all		- make kernel and disk images
+#	images		- make disk images
+#	tape		- make a tape image for a "cold" kernel
+#	loadfile	- make a simh loadfile containing the kernel
+#	unix		- make the kernel
+#	clean		- delete intermediate files
+#	clobber		- delete all generated files
+#
+# settings:
+#	EXTRAPATCHES - list of extra patches to apply
+#	USECOREPATCHES - "yes" or "no", use the core set of patches
+#
+# Examples:
+#	make
+#		build disk images and unix and run unix in simh
+#	make unix tape EXTRAPATCHES=cold
+#		build a "cold" kernel and a tape to boot it with.
+
+
+USECOREPATCHES = yes
+EXTRAPATCHES = 
+
+ALL = loadfile rf0.dsk rk0.dsk
+ML= ../tools/ml
+MKFS = ../tools/mkfs
+MKTAPE = ../tools/mktape.py
+APOUT_ROOT = ../fs/root
+APOUT = APOUT_ROOT=$(APOUT_ROOT) ../tools/apout/apout
+AS = $(APOUT) $(APOUT_ROOT)/bin/as
+NM = $(APOUT) $(APOUT_ROOT)/bin/nm
+TREECOPY = rsync -a --exclude .svn
+KSRCS = u0.s u1.s u2.s u3.s u4.s u5.s u6.s u7.s u8.s u9.s ux.s
+ALLSRCS = $(KSRCS) init.s sh.s
+CLEANSRCS = $(ALLSRCS:.s=.clean)
+PAGES = ../pages/e00-01 ../pages/e00-02 ../pages/e00-03 ../pages/e00-04 \
+	../pages/e00-05 ../pages/e00-06 ../pages/e00-07 ../pages/e00-08 \
+	../pages/e00-09 ../pages/e00-10 ../pages/e01-01 ../pages/e01-02 \
+	../pages/e01-03 ../pages/e01-04 ../pages/e01-05 ../pages/e01-06 \
+	../pages/e01-07 ../pages/e01-08 ../pages/e01-09 ../pages/e01-10 \
+	../pages/e02-01 ../pages/e02-02 ../pages/e02-03 ../pages/e02-04 \
+	../pages/e02-05 ../pages/e02-06 ../pages/e02-07 ../pages/e02-08 \
+	../pages/e02-09 ../pages/e02-10 ../pages/e03-01 ../pages/e03-02 \
+	../pages/e03-03 ../pages/e03-04 ../pages/e04-01 ../pages/e04-02 \
+	../pages/e04-03 ../pages/e04-04 ../pages/e04-05 ../pages/e04-06 \
+	../pages/e04-07 ../pages/e05-01 ../pages/e05-02 ../pages/e05-03 \
+	../pages/e05-04 ../pages/e05-05 ../pages/e05-06 ../pages/e06-01 \
+	../pages/e06-02 ../pages/e06-03 ../pages/e06-04 ../pages/e06-05 \
+	../pages/e06-06 ../pages/e07-01 ../pages/e07-02 ../pages/e07-03 \
+	../pages/e07-04 ../pages/e07-05 ../pages/e07-06 ../pages/e07-07 \
+	../pages/e07-08 ../pages/e08-01 ../pages/e08-02 ../pages/e08-03 \
+	../pages/e08-04 ../pages/e08-05 ../pages/e08-06 ../pages/e08-07 \
+	../pages/e08-08 ../pages/e08-09 ../pages/e09-01 ../pages/e09-02 \
+	../pages/e09-03 ../pages/e09-04 ../pages/e09-05 ../pages/e09-06 \
+	../pages/e09-07 ../pages/e09-08 ../pages/e10-01 ../pages/e10-02 \
+	../pages/e11-01 ../pages/e11-02 ../pages/e11-03 ../pages/e11-04 \
+	../pages/e11-05 ../pages/e11-06 ../pages/e11-07 ../pages/e12-01 \
+	../pages/e12-02 ../pages/e12-03 ../pages/e12-04
+
+# make the important stuff
+all : $(ALL)
+
+# reconstitute sources from ocr'd pages
+$(CLEANSRCS) cleansrc : $(PAGES)
+	@echo Building clean source...
+	@r() { cat ../pages/$$1-* >$$2.clean ; } ; \
+		r e00 u0; \
+		r e01 u1; \
+		r e02 u2; \
+		r e03 u3; \
+		r e04 u4; \
+		r e05 u5; \
+		r e06 u6; \
+		r e07 u7; \
+		r e08 u8; \
+		r e09 u9; \
+		r e10 ux; \
+		r e11 sh; \
+		r e12 init
+	@touch cleansrc
+
+# patch the clean sources
+# XXX what if we do USECOREPATCHES=no and we want to apply
+# one of the cores as an EXTRAPATCH?
+$(ALLSRCS) patched : $(CLEANSRCS)
+	@echo Patching...
+	@for src in $(CLEANSRCS) ; do \
+		cp $$src `basename $$src .clean`.s; \
+	done
+	@if [ $(USECOREPATCHES) = "yes" ] ; then \
+		for p in ../patches/core/*.patch ; do \
+			echo ' ' `basename $$p .patch`;	\
+			patch -s -p1 < $$p; \
+		done; \
+	fi
+	@for p in $(EXTRAPATCHES) ; do \
+		echo ' ' $$p; \
+		patch -s -p1 < ../patches/$$p.patch; \
+	done
+	@touch patched
+
+# build the unix kernel from the KSRCS using the v2 assembler.
+# XXX make ml take cmd line args for input and output file.
+unix loadfile usyms : $(KSRCS)
+	@echo Building kernel...
+	@$(AS) u?.s
+	@$(NM) a.out | sort > usyms
+	@$(ML)
+	@mv a.out unix
+
+# build init from sources
+# XXX make fixaout.py overwrite a.out instead of write b.out
+init : init.s
+	@echo Building init...
+	@$(AS) init.s
+	@../tools/fixaout.py
+	@rm a.out
+	@mv b.out init
+
+# build sh from sources
+# XXX make fixaout.py overwrite a.out instead of write b.out
+sh : sh.s
+	@echo Building sh...
+	@$(AS) sh.s
+	@../tools/fixaout.py
+	@rm a.out
+	@mv b.out sh
+
+# build a prototype filesystems
+# XXX shell is not quite ready for prime time.  works partially but
+# not from login.
+root usr protofs : init sh
+	@echo Building filesystems...
+	@$(TREECOPY) ../fs/root .
+	@$(TREECOPY) ../fs/new/etc root
+	@$(TREECOPY) ../fs/usr .
+	@cp init root/etc/init
+	@cp sh root/bin/xsh
+	@touch protofs
+
+# build filesystem images
+rf0.dsk rk0.dsk images : protofs
+	@echo Building disk images...
+	@$(MKFS) -p ../fs/Readme root rf0.dsk rf
+	@$(MKFS) -p ../fs/Readme root rk0.dsk rk
+	@touch images
+
+# build a tape image
+tape : protofs
+	@echo Building tape image...
+	@$(MKTAPE) root root/bin/* root/etc/*
+
+install : rf0.dsk rk0.dsk loadfile tape
+	@echo Installing...
+	@cp rf0.dsk rk0.dsk loadfile tape ../images
+	
+# clean intermediate files
+clean :
+	rm -f $(CLEANSRCS) cleansrc
+	rm -f $(ALLSRCS) patched *.orig
+	rm -f unix usyms
+	rm -rf usr root protofs
+	rm -f init sh
+	rm -f images
+
+# clean intermediate and target files
+clobber : clean
+	rm -f tape
+	rm -f loadfile
+	rm -f rf0.dsk rk0.dsk
+