Batch convert a favicon.svg file in a favicon.ico image (different sizes)

Makefile

# Batch convert a favicon.svg file in a favicon.ico image (different sizes)
# This makefile uses inkscape, convert, optipng and advpng command line tools
# type make favicon
# Cristian Martinez
all: icons

# Input SVG images without extensions
IMAGES   = favicon

# Output PNG sizes
SIZES	 = 16 32 48 64 72 128

# Commands
INKSCAPE = inkscape
CONVERT  = convert
OPTIPNG  = optipng
ADVPNG   = advpng

DASH     = -

INPUTS   := $(foreach icon, $(IMAGES), $(icon).svg)
OUTPUTS  := $(patsubst %.svg, %, $(INPUTS))
SUFFIXES := $(foreach size, $(SIZES), $(DASH)$(size).png)
OUTPUTS  := $(foreach img, $(OUTPUTS), $(addprefix $(img),$(SUFFIXES)))

favicon: $(OUTPUTS)
	$(CONVERT) $(OUTPUTS) favicon.ico 

icons: $(OUTPUTS) .FORCE

%.png:
	@echo "# creating $@"
	@$(INKSCAPE) --export-png $@ -w $(lastword  $(subst $(DASH),.svg ,$*)) \
	                                $(firstword $(subst $(DASH),.svg ,$*))
	@$(OPTIPNG) -quiet -o7 $@
	@$(ADVPNG) -q -z -4 $@
#       @$(CONVERT)  $@ -border 0 -compress None $@

clean:
	@rm -f $(OUTPUTS)
	@echo "all files have been removed"
	
.FORCE: