diff --git a/mach/sun2/Action b/mach/sun2/Action
index d550d1f2a..02f0bb294 100644
--- a/mach/sun2/Action
+++ b/mach/sun2/Action
@@ -8,6 +8,7 @@ name "Sun 2 M68000 C libraries"
 dir libcc
 end
 name "Sun 2 M68000 Occam library"
+system "vax_bsd4_2|sun*"
 dir liboc
 end
 name "Sun 2 M68000 Modula-2 library"