diff --git a/Makefile b/Makefile
index 4a68698..3cf80f0 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,15 @@
-build: build/allparts.svg
+UNAME = $(shell uname)
+ifeq ($(UNAME), Linux)
+	SCAD = openscad
+endif
+ifeq ($(UNAME), Darwin)
+	SCAD = OpenSCAD
+endif
+
+b: build/allparts.svg
+
+build:
+	mkdir -p build
 
 build/%.scad: ag24.dat edgevertical.dat src/*.rs
 	mkdir -p build
@@ -17,21 +28,21 @@ edgevertical.dat: edgevertical.zip
 	unzip -p edgevertical.zip Edge-Vertical.dat > edgevertical.dat
 
 build/%.png:  build/%.scad
-	OpenSCAD --colorscheme Metallic -o $@ $<
+	$(SCAD) --colorscheme Metallic -o $@ $<
 
 build/%.svg:  build/%.scad
-	OpenSCAD -o $@ $<
+	$(SCAD) -o $@ $<
 
 build/%.stl:  build/%.scad
-	OpenSCAD -o $@ $<
+	$(SCAD) -o $@ $<
 
 build/%.dxf:  build/%.scad
-	OpenSCAD -o $@ $<
+	$(SCAD) -o $@ $<
 
 build/%.dwg:  build/%.svg
 	svg2dwg -no-gui -no-dock-icon -o $@ $<
 
-.PHONY: svgs dxfs clean nest run
+.PHONY: svgs dxfs clean b
 svgs: build/%.scad
 	ls build/part*.scad | sed 's/scad/svg/' | xargs make
 
@@ -41,3 +52,6 @@ dxfs: build/%.scad
 clean:
 	rm -rf build
 	rm *.selig
+
+vis: build/assembly.scad
+	openscad build/assembly.scad