libz-rs-sys is used at run time in 8 crates (of which 2 optionally). It is a direct run-time dependency in 2 crates.

Depender (with downloads and own rev deps) libz-rs-sys version
7.7M 2076 flate2 optional ^0.4.0
120 libz-rs-sys-cdylib ^0.4.0