FindZLIB: make sure zlib.h exists before reading it
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@ -36,7 +36,7 @@ FIND_LIBRARY(ZLIB_LIBRARY
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)
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MARK_AS_ADVANCED(ZLIB_LIBRARY ZLIB_INCLUDE_DIR)
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IF (ZLIB_INCLUDE_DIR)
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IF (ZLIB_INCLUDE_DIR AND EXISTS "${ZLIB_INCLUDE_DIR}/zlib.h")
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FILE(READ "${ZLIB_INCLUDE_DIR}/zlib.h" ZLIB_H)
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STRING(REGEX REPLACE ".*#define ZLIB_VERSION \"([0-9]+)\\.([0-9]+)\\.([0-9]+)\".*" "\\1.\\2.\\3" ZLIB_VERSION_STRING "${ZLIB_H}")
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ENDIF()
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