Earlier I updated a Github repository which generates DEB packages suitable for Metztli Reiser4 and/or Debian Buster Backports for AMD64. It has only been tested under Metztli Reiser4, AMD64 architecture -- as we run this site under similar build.
What is unique about this repository is that it will generate a ModSecurity v3 Nginx Connector v1.0.1 module suitable for nginx-full, nginx-light, nginx-extras (as labeled by Debian). Note: the libmodsecurity3 3.0.4 and libmodsecurity-dev 3.0.4 standalone packages should be installed a priori.
You are welcome to build the packages from our GitHub source: Debian ModSecurity Nginx Connector
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We will take care of the technical complexity so that you can be free to focus on creating your unique brand and/or service message to the world!