sha256sum zlib-1.2.13.tar.xz # Expected checksum: (check zlib.net for latest, example): # 6652f5f15b3b5e91c5bc55e6f4d5c9f9c5f6c9b9c2c8b7f1a6d4e7c3b2a9f8e1

: Fixed a bug in block type selection when using Z_FIXED , ensuring the smallest block type is selected for better compression.

After extraction ( tar -xf zlib-1.2.13.tar.xz ), you will find: