MinGW c++ compiler zlib1.dll missing error?

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I had this same problem, but fixed it like this:

  1. I ran the MinGW Installation Manager (e.g. C:\MinGW\libexec\mingw-get\guimain.exe).

  2. I navigated to All Packages -> MinGW -> MinGW Libraries.

  3. I checked the boxes next to mingw32-libz (dev & dll).

    Screenshot

  4. I went to Installation -> Apply Changes.

Now everything worked properly.

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