I've used Phil's instructions to set up a build area with a Makefile.

You can run make build from the top to build things.

Makefile

@@ -5,7 +5,10 @@ SYSDIR=sys
 CMDDIR=bin
 TESTDIR=tests
 
-all: sys cmd others tests
+all: sys cmd others tests build
+
+build: cmd others
+	cd build && make
 
 runsh: all
 	cd bin && ../tools/a7out sh
@@ -40,22 +43,20 @@ cmd: dirs
 #	$(AS) $(ASARGS) -o $(CMDDIR)/dsksav    src/cmd/dsksav.s
 #	$(AS) $(ASARGS) -o $(CMDDIR)/dsw    src/cmd/dsw.s
 	$(AS) $(ASARGS) -o $(CMDDIR)/ed    src/cmd/ed2.s src/cmd/ed1.s
-#	$(AS) $(ASARGS) -o $(CMDDIR)/init    src/cmd/init.s
+	$(AS) $(ASARGS) -o $(CMDDIR)/init    src/cmd/init.s
 
 others: dirs
 	$(AS) $(ASARGS) -o $(CMDDIR)/sh    	src/other/pbsh.s	
-	$(AS) $(ASARGS) -o $(CMDDIR)/ops    	src/other/ops.s	
 
 # wkt apps
-	$(AS) $(ASARGS) -o $(CMDDIR)/wktls    	src/other/wktls.s	
+	$(AS) $(ASARGS) -o $(CMDDIR)/ls    	src/other/wktls.s	
 	$(AS) $(ASARGS) -o $(CMDDIR)/wktcat    	src/other/wktcat.s	
 	$(AS) $(ASARGS) -o $(CMDDIR)/wktcp    	src/other/wktcp.s	
-	$(AS) $(ASARGS) -o $(CMDDIR)/wktdate  	src/other/wktdate.s	
-	$(AS) $(ASARGS) -o $(CMDDIR)/wktln  	src/other/wktln.s
-	$(AS) $(ASARGS) -o $(CMDDIR)/wktls  	src/other/wktls.s		
-	$(AS) $(ASARGS) -o $(CMDDIR)/wktmv    	src/other/wktmv.s	
-	$(AS) $(ASARGS) -o $(CMDDIR)/wktopr    	src/other/wktopr.s	
-	$(AS) $(ASARGS) -o $(CMDDIR)/wktstat  	src/other/wktstat.s	
+	$(AS) $(ASARGS) -o $(CMDDIR)/date  	src/other/wktdate.s	
+	$(AS) $(ASARGS) -o $(CMDDIR)/ln  	src/other/wktln.s
+	$(AS) $(ASARGS) -o $(CMDDIR)/ls  	src/other/wktls.s		
+	$(AS) $(ASARGS) -o $(CMDDIR)/mv    	src/other/wktmv.s	
+	$(AS) $(ASARGS) -o $(CMDDIR)/stat  	src/other/wktstat.s	
 
 tests: dirs
 	$(AS) $(ASARGS) -o $(TESTDIR)/decimal_out    	src/tests/decimal_out.s	
@@ -75,3 +76,4 @@ clean:
 	rm -rf $(SYSDIR)/*
 	rm -rf $(CMDDIR)/*
 	rm -rf $(TESTDIR)/*
+	cd build && make clean