make output dir automatically

diff --git a/Makefile b/Makefile
index 60f26f4..38e515b 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -10,4 +10,5 @@ STL_FILES = $(STL_FILES_1:%.scad=%.stl)
 all: $(STL_FILES)
 
 output/%.stl: %.scad $(INCLUDES) configuration.scad
+    mkdir -p output
        openscad -o $@ $<