6.11. Zlib-1.2.5

The Zlib package contains compression and decompression routines used by some programs.

Approximate build time: less than 0.1 SBU
Required disk space: 2.8 MB

6.11.1. Installation of Zlib

First, fix a typo in the package header file:

sed -i 's/ifdef _LARGEFILE64_SOURCE/ifndef _LARGEFILE64_SOURCE/' zlib.h

Prepare Zlib for compilation:

CFLAGS='-mstackrealign -fPIC -O3' ./configure --prefix=/usr

The meaning of the new configure environment variable:

CFLAGS='-mstackrealign -fPIC -O3'

Setting CFLAGS overrides the default optimization in the package to prevent some run time errors. Note that the -mstackrealign may cause build failures in non-Intel architeture systems.

Compile the package:


To test the results, issue:

make check

Install the package:

make install

The shared library needs to be moved to /lib, and as a result the .so file in /usr/lib will need to be recreated:

mv -v /usr/lib/libz.so.* /lib
ln -sfv ../../lib/libz.so.1.2.5 /usr/lib/libz.so

6.11.2. Contents of Zlib

Installed libraries: libz.{a,so}

Short Descriptions


Contains compression and decompression functions used by some programs