Make keygen more make-friendly

Makefile

@@ -0,0 +1,34 @@
+# Makefile for keygen
+
+# Executables
+SCAD = OPENSCADPATH=src:build openscad
+POLY = PYTHONPATH=/usr/share/inkscape/extensions bin/paths2openscad.py
+
+SCAD_DIR = src
+SVG_DIR = resources
+POLY_DIR = build
+STL_DIR = build
+
+# Files to include
+SVG_SRC  = $(wildcard $(SVG_DIR)/*.svg)
+SCAD_SRC  = $(wildcard $(SCAD_DIR)/*.scad)
+
+# Generated polygon files
+POLY_OBJ = $(patsubst $(SVG_DIR)/%.svg,$(POLY_DIR)/%.gen.scad,$(SVG_SRC))
+
+# Generated STL
+STL_OBJ = 
+
+OBJECTS = $(POLYGON_OBJ) $(STL_OBJ)
+
+# Assembler, compiler, and linker flags
+POLYFLAGS  = 
+SCADFLAGS  = 
+
+# Targets
+all: $(STL_OBJ)
+poly: $(POLY_OBJ)
+clean:
+	-rm -f $(OBJECTS)
+$(POLY_DIR)/%.gen.scad: $(SVG_DIR)/%.svg
+	$(POLY) $(POLYFLAGS) --fname $@ $<