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Brad King authored
Perform multiple separate searches in order. If ZLIB_ROOT is set search it exclusively so it takes precedence over CMAKE_PREFIX_PATH. This allows a user to provide -DZLIB_ROOT=/path/to/zlib/prefix on the CMake command line to tell it exactly where to find zlib. Otherwise fall back to a normal search. Inspired-by: Andreas Schneider <asn@cryptomilk.org>
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