Makefile: set AUTOINCS with +=

diff --git a/Makefile b/Makefile
index 253eb3937b67a70ce1d9295b827d153dd65b264f..e1ac0b646a4fde574e323a9dcdec36aa4ac8216e 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -34,7 +34,7 @@ USING_AUTOS ?= $(FILAMENTSPOOL_AUTOS) xeno-drivebay-bracket dungeonquest-cone an
 
 AUTO_TOPLEVELS := $(foreach m,$(USING_AUTOS),$(shell $(PLAY)/toplevel-find $m))
 
-AUTO_INCS = funcs.scad utils.scad sealing-box.scad sewing-table.scad
+AUTO_INCS += funcs.scad utils.scad sealing-box.scad sewing-table.scad
 
 default:       autoincs scads