Add support for zlib (de)compression

Packages describing “zlib” as local USE flag

Package “zlib” Flag Description
net-proxy/privoxy Use sys-libs/zlib to decompress data before filtering
dev-libs/libpcre2 Add support for pcregrep command to search within gzip-compressed files (via sys-libs/zlib).
dev-haskell/io-streams Include zlib support
dev-php/PEAR-HTTP_Request2 Force dev-lang/php to be compiled with zlib extension
net-im/ejabberd Enable Stream Compression (XEP-0138) using zlib
app-arch/libarchive Allow accessing gzip-compressed archives through sys-libs/zlib. This only affects libarchive's native support: bsdtar will keep using gunzip as a filter if that's not built-in. It's also needed for supporting extraction of ZIP files.
net-im/prosody Support for compressing XMPP streams with mod_compression
sys-apps/s390-tools build the zgetdump and dump2tar utilities
app-text/libstaroffice Enable support for compressed data
dev-perl/Mail-IMAPClient Install support for COMPRESS DEFLATE connections
dev-libs/libpcre Add support for pcregrep command to search within gzip-compressed files (via sys-libs/zlib).
media-libs/imlib2 Zlib loader support
media-gfx/alembic Use sys-libs/zlib for compressions
sys-apps/kmod Enable support for gzipped modules
net-irc/znc Enable mod_deflate-like gzip support for znc's web interface using sys-libs/zlib.
sys-apps/pciutils Support compressed pci.ids database

All packages providing a “zlib” USE flag (133)