Hi Mihail,
cmake setting _IMPORT_PREFIX to ON is definitely a bug. Thank you for bringing this to our attention. I’ll open an issue.
A potential workaround while we address the issue could be to work with a local build instead of installing the library. The following should work, but let us know if you have any issues.
> cd {path to openfhe-configurator}
> ./scripts/configure.sh
> cp {path to example.cpp} openfhe-staging/openfhe-development/src/pke/examples/
> ./scripts/build-openfhe-development-hexl.sh
> ./openfhe-staging/openfhe-development/build/bin/examples/pke/example