In my cmake project I need to use system version of libxml2 on macOS 
(/usr/lib/libxml2.dylib), however in case it is installed in MacPorts the 
latter version is picked by find_package. On the other hand I'd like to avoid 
hardcoding absolute path, just in case Apple changes some path or file name in 
future OS version.

I've tried 

find_package(LibXml2 2.8.0 REQUIRED PATHS "/usr" NO_DEFAULT_PATH)

however it fails to find anything at all. Any ideas?


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