diff --git a/mach/pdp/Action b/mach/pdp/Action
index fbe1967a1..3051d78c3 100644
--- a/mach/pdp/Action
+++ b/mach/pdp/Action
@@ -4,6 +4,9 @@ end
 name "PDP 11 backend"
 dir cg
 end
+name "PDP 11 target optimizer"
+dir top
+end
 name "PDP 11 interpreter"
 system pdp*
 dir int
@@ -16,6 +19,10 @@ name "PDP 11 EM library"
 system pdp*
 dir libem
 end
+name "PDP 11 systemcall library"
+system pdp*
+dir libsys
+end
 name "PDP 11 Pascal library"
 system pdp*
 dir libpc