change to use attach functions.
$a means switch thread in core dumps.
(maybe that should be $A now?).

src/cmd/db/mkfile

diff --git a/src/cmd/db/mkfile b/src/cmd/db/mkfile
index 00e7a75..9ed0c02 100644
--- a/src/cmd/db/mkfile
+++ b/src/cmd/db/mkfile
@@ -17,7 +17,7 @@
 
 HFILES=defs.h\
 	fns.h\
-
+	$PLAN9/include/mach.h\
 
 <$PLAN9/src/mkone