Can't find ZLIB (missing: ZLIB_LIBRARY) Ubuntu 20 CMake

Usage
3

These are environment variables. Find modules sometimes, but rarely, use these. You need to pass them as CMake variables. For example:

cmake -DZLIB_LIBRARY=/usr/local/zlib/lib/libz.so -DZLIB_INCLUDE_DIR=/usr/local/zlib/include $builddir