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When running swift 5.5.3 or swift-5.7 under ubuntu 20.04, there are many warnings saying "zlib is not available." A simple c++ test program which links to zlib had no problem compiling and executing. The dpkg command found the library at /lib/x86_64-linux-gnu/libz.so.1.2.11 with pointers at /lib/x86_64-linux-gnu/libz.so.1 and /usr/lib/x86_64-linux-gnu/libz.so

efr
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  • You can try the command : ldconfig -p – Ptit Xav Oct 01 '22 at 17:19
  • $ ldconfig -p found pointers to libz.so.1.2.11: libz.so.1 (libc6,x86-64) => /lib/x86_64-linux-gnu/libz.so.1 libz.so.1 (libc6) => /lib/i386-linux-gnu/libz.so.1 libz.so (libc6,x86-64) => /usr/lib/x86_64-linux-gnu/libz.so – efr Oct 07 '22 at 01:43
  • Did you install zlib1g-dev ? Cf [swift forum](https://forums.swift.org/t/swift-installation-problem-on-ubuntu-64-bit-20-04-4/57365/2) – Ptit Xav Oct 07 '22 at 08:59

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