TIMESTAMP = 1501238385
SHA256 (libpng-1.6.31.tar.xz) = 232a602de04916b2b5ce6f901829caf419519e6a16cc9cd7c1c91187d3ee8b41
SIZE (libpng-1.6.31.tar.xz) = 991824
SHA256 (libpng-1.6.31-apng.patch.gz) = a10645f0af2aa23e0f437b2b7ce784c1398ba9e05555a1b61fee510bab22c227
SIZE (libpng-1.6.31-apng.patch.gz) = 10308