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Friedrich W. H. Kossebau authored
LIBXML2_INCLUDE_DIRS instead of LIBXML2_INCLUDE_DIR has all the needed include dirs also of other libraries in the public interface. iconv.h as used by libxml/encoding.h was not found on Windows due to that. As CMake 3.16 is the min required version meanwhile, also resolve the existing TODO and switch to the imported target LibXml2::LibXml2, which has the DIRS variant set in the link interface property.
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