One thing to be aware of, these replacement zlib libraries are not always "drop in" safe as some software such as nginx pre-allocate the zlib state buffers by h

One thing to be aware of, these replacement zlib libraries are not always "drop in" safe as some software such as nginx pre-allocate the zlib state buffers by hard coding in the original zlib structure sizes (the original zlib makes guarantees about memory usage that technically makes this behavior somewhat OK). Depending on how well the software is designed, the forked zlib versions may result in buffer overflows or other crashing. (nginx is fine - it spams your log file with errors and re-allocates).