Currently MSYS2, a shell port on Windows, provide a wide range of *unix Developer's tools (see msys2 Wiki and MSYS2 at SourceForge.net, etc.). Among other things it allow to process ./configure scripts of autotools or autotools-like builds systems, generate Makefiles for specified configuration and build them using GNU make. Thus many notable Open Source libraries (e.g. libiconv, ICU, MPIR, etc.) has MSYS2 toolchains in its build systems.

If ZLIB would provide MSYS2 support, it allow to make its configuration more flexible (split builds to <Debug|Release><Shared|Static> configurations, as implemented for other platforms), and simplify build, install and test tasks.

Alexander