Added instruction for existing ZLIB configuration

Using two configuration flags `DZLIB_INCLUDE_DIR` and `DZLIB_LIB` we can locate an existing ZLIB on the system
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Abdul Sami 2018-02-21 12:17:55 +05:00 committed by GitHub
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@ -302,6 +302,11 @@ further disable the option `-Dprotobuf_MSVC_STATIC_RUNTIME=OFF`.
If it reports NOTFOUND for zlib_include or zlib_lib, you might haven't put
the headers or the .lib file in the right directory.
If you already have ZLIB library and headers at some other location on your system then alternatively you can define following configuration flags to locate them:
-DZLIB_INCLUDE_DIR=<path to dir containing zlib headers>
-DZLIB_LIB=<path to dir containing zlib>
Build and testing protobuf as usual.
Notes on Compiler Warnings