I’d strongly advise you to install Zammad via the official package for CentOS instead of building Zammad your own. This will save you a lot of pain. Updates are easy as 123 when using the packages while doing them manually comes with a lot of overhead.
If you want to build Zammad yourself make sure you have all the OS dependencies installed you need. You can find a list of them in the configuration file of our packaging service.
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