lib32z1-dev - 1:1.2.11.dfsg-1+deb10u2 main

zlib is a library implementing the deflate compression method found
in gzip and PKZIP. This package includes the development support
files for building 32 bit applications.
.
This package should ONLY be used for building packages, users who do
not need to build packages should use multiarch to install the relevant
runtime.