diff --git a/Makefile b/Makefile
index ebc66302..12832366 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-SRC = system midas
+SRC = system syseng sysen1 midas
 MINSYS = _ sys sys3 sysbin
 RAM = bin/boot/ram.262
 NSALV = bin/boot/salv.rp06
diff --git a/build/build.tcl b/build/build.tcl
index 0aa34f1b..56c6c516 100644
--- a/build/build.tcl
+++ b/build/build.tcl
@@ -92,6 +92,15 @@ respond "*" ":load midas;midas bin\r"
 respond "*" "purify\033g"
 respond "CR to dump" "\r"
 respond "*" ":kill\r"
+
+respond "*" ":midas sysbin;_sysen1;ddt\r"
+expect ":KILL"
+respond "*" ":job ddt\r"
+respond "*" ":load sysbin;ddt bin\r"
+respond "*" "purify\033g"
+respond "*" ":pdump sys;atsign ddt\r"
+respond "*" ":kill\r"
+
 respond "*" ":midas system;_its\r"
 respond "MACHINE NAME =" "AI\r"
 expect ":KILL"