diff --git a/cameo/templates/mkmk-simple b/cameo/templates/mkmk-simple
index 9d3350d..437afa5 100755
--- a/cameo/templates/mkmk-simple
+++ b/cameo/templates/mkmk-simple
@@ -42,7 +42,8 @@ if [ "$ROT" ]; then
     rot="rotate $ROT"
 fi
 
-edges=
+edges=$NAME.gp
+[ -r "$edges" ] || edges=
 for n in PCB_Edges.gbr Edge_Cuts.gbr Edge_Cuts.pho; do
     if [ -r "../$NAME-$n" ]; then
 	edges=../$NAME-$n
@@ -63,7 +64,8 @@ while [ $yi -lt $YN ]; do
 	cameo <<EOF || exit
 mm
 
-gerber 35mil $edges
+`if [ "$edges" != "${edges%.gp}" ]; then echo gnuplot 35mil $edges;
+ else echo gerber 35mil $edges; fi`
 $rot
 align 1 $X0 $Y0		# align relative to board corner
 translate 4mm 4mm	# move to PCB zone assigned to project
@@ -87,7 +89,8 @@ $write mill.gp
 remainder
 empty
 
-gerber $MILL_OUT $edges
+`if [ "$edges" != "${edges%.gp}" ]; then echo gnuplot $MILL_OUT $edges;
+ else echo gerber $MILL_OUT $edges; fi`
 offset
 append mill.gp
 EOF