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1c1 < CFLAGS := -Wall -Wextra -Werror -std=c89 -pedantic -O2 --- > CFLAGS := -Wall -Wextra -std=c89 -pedantic -O2 3c3 < LIBPNG_FLAGS := $(shell pkg-config --cflags --libs libpng12) --- > LIBPNG_FLAGS := $(shell pkg-config --cflags --libs libpng)