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Unlike unix systems (Linux,

Unlike unix systems (Linux, macos, etc), there is no standard path to zlib (headers, library), also there is no standard name for the library, it may be called zlib(.lib,.dll) zlib.lib+zlib1.dll, zlib_static.lib, etc.
So, I'm unable to provide specific and precise instructions, only general direction:

Easiest way to re-build libraw under Windows is to call
nmake -f Makefile.msvc
(for example, In Visual Studio command prompt)

So, modify Makefile.msvc to add /DUSE_ZLIB, path to zlib includes in compiler flags, flags to link with zlib to link flags

Alternatively, you may use Visual Studio solution/project provided and add the same to project properties via property settings.

-- Alex Tutubalin @LibRaw LLC