The GDS feature of Qt OPC UA requires the OpenSSL 1.1 headers and libraries.
If OpenSSL is not installed to a path that is searched by default, the location of the headers and libraries must be passed to the build process.
For example, if OpenSSL 1.1 has been installed to /opt/openssl, the locations must be passed as follows:
-DOPENSSL_ROOT_DIR=/opt/openssl/
If GDS support is not required, it can be disabled by using the following parameters:
-DFEATURE_gds=OFF
In this case, OpenSSL is not required.
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