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Hi, There are very good reasons why packaging an external library is a big headache in general. However, for zlib it's not so bad for several reasons. 1 zlib is stable, code and file format. The last release is 1.5 years old. Manually updating the zlib sources once or twice a year is trivial. 2 For llvm, there should not be a problem with possible security exploits forcing quick patch, as